You can find their features in their respective threads:
http://forum.androidcentral.com/epic-4g-roms-hacks/46793-rom-trulyepic-v2-06-12-10-a.html
http://forum.androidcentral.com/epic-4g-roms-hacks/44699-rom-quantum-v2-0-0-a.html
Quantum was my favorite before TrulyEpic was first released, and Quantum just got it's first update in a while so of course I had to check it out
I'll probably be switching between these two ROMs depending on which has the more recent update, although I now use TrulyEpic's custom launcher in all my ROMs because it's just so fast.
although i have a basic understanding so far of this flashing process, can someone explain to me what"VERSION 2.x.x REQUIRES THE DK28 MODEM!" means in regard to flashing this rom?
edit. is the modem separate? where do i get it?