I would ask myself...
Which ROM works best from the kitchen?
Be careful though, "Best" threads aren't allowed in this forum. However, I have to agree with jd, keep it stock. Try to keep AMDL firmware so you can root it and put a custom recovery on it (for nandroid backup purposes). But even if it does update to MF3, it is still rootable. There are plenty of functions and abilities on the stock ROM and if something goes wrong there's a better chance to fix it or get it fixed. Good luck.
SGH-I337 (AT&T) 32GB
P-ROM (1st Gen.), De-Odexed, AMDL
Auto-LOKI OUDHS CWM
Make sure you read and understand the "PINNED" threads in the "General" and "Q & A" sections of the AT&T S4 forum BEFORE you ask for help. Use the forum's "search" function to find posts with additional information. You should not expect others to help you if you haven't tried to help yourself first. Also, read, understand, and follow the "XDA" rules.