I don't know about the quality but I prefer working with the 22 awg wires. Just because it's a little bigger and easier to terminate. Personally I wouldn't worry to much about the quality. If you get something from whirlwind, rapco or proco, I don't think you are going to be disappointed. West Penn, Canare, Belden are good brands of wire. I would stay away from some cheap off brand sold by some box house or something. This kind of subject always tends to bring different opinions. I've learned over the years to also consider the environment your listening in. A typical church sanctuary is not going to sound good enough acoustically or electronically to hear the difference between a whirlwind snake versus a proco snake. The size or gauge depends on what you're gonna do with the wire as well. With floor pockets you'll need to take those mic lines and bring them together somewhere behind stage and get them going to FOH. You'll obviously be using raw mic cable and run your floor pockets with that but then you'll have to terminate / splice at a focus point to send all those lines to FOH. How are you planning to do this?
Were you wanting a road snake in order to run floor pocket lines and then just plug those into the stage box end of the snake? Not a bad way, I've seen this before. This would also give you a mic patch point if you decide to change what mic jack goes to which fader on the mixer without having to get behind the mixer. There are more "correct" ways to acheive this but this way would be okay.
If you didn't use a road snake and just got snake cable you could use some type of punch block to splice the floor pocket lines into the snake cable. This punch block would be housed in a metal box for RF shielding. Obviously you would not have the luxury of a patchpoint like I described earlier.
Some jobs I've done the designer did NOT want any break in the mic line so we had to run raw mic lines all the way from floor pocket to mixer. This was all in conduit.
Lots of options here just depends on what you want to do and how much money you have to spend on this. Hope this helps.
Rob