What are you wanting to get out of the membership?
Depending on where you live, it will be a pretty good drive to one or the other of those two clubs -- they are a good 25 minutes apart.
Don't forget about Miramont while you're at it.
Traditions is newer and has a nicer clubhouse. I can't compare the pools between the two because Pebble Creek is refurbishing theirs right now.
Pebble Creek has tons of family/kid-friendly events where the kids get to run around outside, play in a bounce house, etc.
You'll find better food at, say, a chain restaurant such as BJ Brewhouse than at those clubs.