You made the choice to start tying your own bands... *That's Great!!!!*
Making or tying your own bands is the best way to get the most enjoyment out of the slingshot sport or hobby. Maybe a little frustration too while learning but that's okay. We are here to help and will answer what we can. Like most things in this hobby, there is a best for individual shooters and not always a best in the market. I may like one brand/style of hold, latex, ammo, or frame and another shooter not able to use it and I not able to shoot theirs. Even though each of us with are own setup can be top shots.
So what pouch is best?
Well, the real answer is... its kind of complicated and a bit technical.
Unfortunately, it's not always the pouch you like the looks of most or the one you want it to be. Rather it should be the pouch that you shoot the best. Yes, you can like one and not shoot it well. Without naming any brands there are a few pouches I like the looks of and/or the feel of, but, I do not shoot them well. This can simply be down to we all have different types of skin. Some of us have rougher hands and some smoother. There is also one of the tiny pouch designs I absolutely hate the feel of but yet it shoots so incredibly well for me, but only with 5/16" or 8mm ammo. The bottom line is you just have to try them to find out the best combo for you. The most important thing to keep in mind is the size of the ammo you will be shooting. Too small of a pouch and the ammo can pop out too early. Too big and the pouch can catch air like a sail or parachute which can reduce velocities.
Bonus tip!
Different pouches weigh differently according to the material they are made from and their thickness. Keep this in mind when trying a new taper and you get handslap. A lighter or heavier pouch may eliminate that handslap completely. Thus you are able to keep the taper you like with only changing a pouch. It is best to have a selection of pouches on hand that way you can try different combos.