T Mobile S4 on AT&T - Which Roms?

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http://forum.xda-developers.com – Hey everyone, I'm definitley not a noob at flashing roms / rooting / unlocking , etc....Been flashing phones like crazy the last few years (s3,note2,htc one,nexus,etc)But I have one question that I cannot find the answer anywere.. I bought a T Mobile S4 which was blacklisted on T Mobile so I am using it on AT&T wtih full LTE.. Which Roms do I flash for this thing? Do I flash TMO roms or ATT roms, or does the kernal flash just matter? If this is a stupid question, sorrry! lol. :eek:Just don't want to brick this thing. Thanks Guys. (HowTos)