Stock '69 318, t-quad vs q-jet vs holley vs edelbrock?

First off, congratulations on your "new" car, you're going to have fun with it.
As far as carb choice, all will work. And for the record, there are adapters that will make a spread bore carb work on a square bore intake and vice versa so you don't need to break your head on that or feel like you're limited to one camp or the other. The carter style edelbrock will probably be the "easiest" choice only because of how simple they are for a daily driver and there is still just about unlimited part availability on them. I have an AVS2 on my 360 and I love it. But I used to have a holley (was too big for my engine) and that was a lot of fun to tinker with as well.
T-quad and quadrajets are great carbs that may/may not need a little tuning to get right on your particular engine but once you get it dialed in you basically don't need to ever mess with it again.