that's something you have to look by your own. my daily rom is slim bean 4.3 build 1.
i like Xperience (i am porting that to p311x from p3100), MoKee, CM, Pac, AOSPA, Stockbased rom powered by next and microdelta Too.
You can flash latest next kernel and test every rom as second rom without bad things to your first rom. you can delete 2nd rom without problems if you Don't like the rom or if you want to test another rom. for me 2nd rom only for testing things and i never had any problems. but you can run both Systems as you like.