I have a black car that's got a huge amount of flake in it.
I've used Pete's 53 and it's excellent for flake pop. It doesn't add as much depth as I'd like though. I think it would look great on light colors or solid dark colors but in my opinion, it causes so much "pop" that sometimes my black looked gray where the sun hit it.
I hear good things about 5050 so that's where I'd start if I were going for a CG wax all over again.
Tomorrow I'm going to try a Pete's 53 and 476S combo. If I'm really stoked about how it looks, I'll report back. If not, then I would definitely go with 5050 before Pete's 53.