I am level 36 right now and for questing and dung, I personally prefer Cat form, they have good DPS ... but i always see others druid in bear form. Which is better? Why?

those 2 things are for different gameplay.

cat form is ALL dps. it is mainly to do damage that is it.

bear form is for tanking ( honestly as a healer healing good geared bear tanks ) bear tanking is just a fial in cata atm. their hp/armour is low as fk and they die fast even in good gear. but as a tank your main purpose is to hold aggro.

agro is when you attack and the monster attacks you because of the amount of damage you are doing is high. a tank must learn to keep aggro by using moves specificly to hold aggro. dps ( damage dealers ) will occasionally pull aggro off the tank but the tank should pull the aggro back quickly. a healer can pull aggro just by healing because the mobs dont want a healer to heal the other members so if the tank doesnt do his job you all die in a dungeon.

a tank is MORE wanted/need in the entire game. if you choose to tank and learn to tank very well adn gear yourself properly you will be widely wanted in groups. but with tanking just like healing comes great respoinsibility. you cannot be fking around like what dps do. they basicly fk around and complain your going to slow. fk them they can leave and que again if they dont like your tanking. tanking is about keeping everyone alive and your own pace if you can handle a lot due to gear and the healer can handle it then tank alot if you cannot then dont. tanking isn't about how fast you can finish a dungeon it's about keeping the party alive. and if you die they will most likely blame you. and leave the party.

like i said it takes great responsibility people now a days only care about doing fast dungeon runs. but yet they fking cry when we all die ( whipe ) and then leave the party. its not about being fast. their is a reason why we are all ina group also. you cannot fking do a dungeon alone at the lvl requirments maybe if your like 10+ the lvl requirment you can but nothing less

also as a tank and healer you will very often deal with idiots either its a healer if your a tank , or dps, or if your a healer its the tank and/or dps. someone will always pull usually its dps thinking they can solo the dungeon or because they are trying to rush things and then whipe your party. this is why many people dont choose to tank. like i. i dont tank anymore because im sick and tired of idiots who dont learn to play the game. this isn't some pissy runescape shet you actually need to learn game mechanics and your class and role and learn to cooperate or get fked in the @ss by the big bad dik.