I definitely would pick Optfine becuase of the huge lag reduction. My other favorite mod is GalacticCraft. For me, it gives the game a purpose. You make all sorts of machines and thing to go to the moon, then blast off in a rocket to get there. Once your finally there, you beat the boss, come home, and start preparing for a trip to mars. Unlike just beating the Ender Dragon, there is still more planets and space stations. That is why I like GalacticCraft.