5fingers brings up a few good points here.

I myself leveled until about level 60 as a temple knight. I had great defense and could survive on the monsters much better than royal knights. I was able to spend plenty on aeria points and switched classes early because with all the potions and hp stealers I could survive well enough to level. I didn't die all that often. If I hadn't bought the ap items then I surely would have stayed TK. The choice is yours. Temple Knights survive better but they level slowly. Royal Knights have more attack power and are better off if they have potions to help them stay alive.

One thing I would like to point out is accessory choice can go a long way. If you can get 15-20% life and mana suction you will be well served. You will only need to use health potions and mana potions from time to time. They can be hard to find but if you can get them they come in handy.

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