Honestly, you should experiment to see what roms work best for you. There are a lot of excellent roms on here made by really talented developers who put in a lot of hard work.
I'm currently using Peetr_ 's Hybrid rom. Even with no undervolting (due to locked bootloader), with only setCPU (set cpu profile to 384mhz-486mhz when screen is off) I'm getting insane battery life- 53 hours of standby time without charging and still ticking at 61% (granted, the phone was actually used for an hour.)
Hope you find something you like.
Originally Posted by xperia tl
i have official jb 4.1.2 firmware 9.1.F.1.120
which custom rom to put in?tnx,sorry for bad english