Runes of Magic US / AU

K/P = Possibly the tankiest Knight possible, you can heal yourself for a % of your max HP and further expand your defenses and lower everyone else's agro
K/W = More leaning towards DPS with these elite skills but still able to get the job done, but the main attraction of this class combo was nerfed some time ago so don't even give it attention
K/M = Magical DPS, somehow it becomes a tank too as well, just be aware that I've yet to see a good early game with them, just something about it feels off or I'm doing something absolutely wrong with the alt I tried doing with

As far as the others I'm not quite sure about them, my knowledge of K/S and K/R is limit and wouldn't be worth posting in the first place

if you want to do any serious pve would strongly recomend k/w, k/m best for siege and k/p is good for support. i'm guessing k/m quests the fastest since it does the most damage. any knight combo is going to be tanky thanks to good base ratios, sod and enhaced armor.

the other knights combos are not nearly as played and are overall weaker then the 3 above.

If you want to be the main tank go K/W

K/w is good for burns even tho it was nerfed k/p is good to tho k/r lame

Take k/w/p, best three classes you'll need. K/p is better for strat fights, k/w best for burn.

If you're not overly concerned about being viable at endgame and just having fun, K/R is an interesting combo. It's not viable at all, but I enjoy it. See my thread here for the details on it. Keep in mind that I was learning this class as the thread evolved. With that in mind, disregard the video in the first post seeing as it was mainly just my initial speculations, but does contain some good info so if you wanna watch it, it's up to you. The rest of the thread including the back and forths between me and BlankMinded contain alot of info about both K/R vs K/W. Knight/Rogue Thread

Also, the combo that hasn't been mentioned yet in this thread is K/S. I don't know much about it other than it excels in pulling mobs from range & it has some OP rooting skills.

K/P is basically just a healing support class atm, its a good combo to start with since it doesn't need much gear (just slap on full od shell healer set and a cheap staff), and you'll be able to contribute in mid-tier instances while trying to build your real tank set.

You specifically said playing "solo". That changes things a bit.
K/P is about as tanky and you can get, but it will take you forever to kill anything.
K/R is better at killing things, but is an atypical knight
K/M is just off the scale weird and is quite complicated to pull it off right, gear can get weird also if you go for the magical knight.
K/S is quite capable for solo play with extra ranged attacks
but
K/W is probably your best bet for solo play hitting a bit harder (other than K/M which is special) and being more set up for damage dealing.

Beyond solo play, in an instance K/W will be the only Knight taken as a tank, K/P can go as a buffer, and K/M can be invited as DPS
For seige, K/M can be devastating if set up right, K/P is a good tower taker the others generally switch to W/K, S/K, or R/K

K/M is great for solo play & questing... the only oddity is that you can commit suicide with it. Hardest hitting knight, but you can also hit yourself. Basically, you would gear as a mage w/ a magic 2-h hammer. Once you have the Light Energy Weapon buff, all of your white attacks cause a 2nd MAGICAL attack. <-- this is important... there are instances where if you kill off your target w/ a white attack and focus returns to you.. you will hit yourself. for a lot.

K/P is good for solo play as well, but as has been stated, you can survive pretty much anything.. but will take like 10 minutes to kill something. :)

K/R is pretty nice and fun. This is the king of crits. & After crits, you can use Smash for more damage. I'd be careful about using this until you get your 70 elite, though... Smash normally consumes 7% hp.

K/W is the dps knight. The target defense debuff ( Authoritative Deterence ) is still nice even though the duration got nerfed. You also get a passive to increase all of your 1-h weapon damage.

I've not played w/ K/S, so can't really give you much advice there... I do remember that an old friend ( Holy ) played one & he was pretty good w/ aggro.

I have played all the knight combos besides k/m and i can safely say that k/w and k/p are the best ones to level and tank with.

K/s used to be good, but it fell off when its taunts were nerfed. It also lacks any elite skills that debuff the bosses specs or buffs the parties stats like k/w and k/p do (respectivly) it is why those two are the top chosen knight tanks.

Another thing that people forgot to mention about k/wtanks is a few of their skills. 1, the warrior general skill Berserk. For 30 seconds it boosts your attack by 36% and reduces your defense by that ammount (you use Dhield of diceplin to counter balance that defense loss)
2, defensive formation is the exact opposite of berserk
3, quick reflexes for 30 seconds it increases your physical crit rate and parry rate by an insane ammount which is infinatly usefull while leveling, as lower level gear doesnt have crit rate.
4, fearless helps you over come the fear debuff which is usefull for both raids and questing (the one that makes you run arround randomly)

I will note that k/s was fun to play back at the level 70 cap, it had an elite skill that delt ranged damage, which you could alternate with shot, and kite mobs you were trying to kill. I dont think this skill scaled very well with the level increases. And knights dont typically stat enough physical attack to make shot and the elite skill do to much damage anyway, even for questing

I hear K/S is super fun in PvP and people love sieging against them.