it basically boils down to your commitment level.
with a bama tune on a typical bolt on car, you tell them your mods, they send you a tune thats pretty close (might be good, might need a tweak or two, but it'll be close), a minor revision or two, your done prety much & it can be done in an afternoon (many, many times I have called for revisions on my old white car & had them sent while I was still on the phone, it's a little diffrent with my new car but simular) for the most part.
with a more custom tuner like Joe (I am in no way bashyng Joe with my comments here, he's a great tuner & has always went out of his way to help me with anything I need on my old white car even when I wasn't tuned by him, I would consider him a class act & an honest friend in the buisness) theres a little more work.
he will sent you a base tune to get you & the car started, then you datalog his requests, he looks over the datalog & sends you a revision. then you datalog that tune & he reviews that log & sends you a revision.
you guys repeat that process untill you agree the tune is spot on but it takes some time.
both are good tunes, they are just diffrent approaches.
hope that helps you understand the diffrence.
MM BRACKET RACING CREW CO-FOUNDER
2012 300a GT A6......10.78 @ 124.........sold
2014 301a GT A6.............12.73 @ 112........d/r only