Wax collectors- PSA or GAI?

So PSA has been in the pack grading biz for a while now. I see more and more PSA packs on ebay these days. Do you mix and match PSA and GAI? If not which company do you prefer and why?
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I like GAI's holder better, due to its smaller size. It shows off the pack more than the holder. But I think the PSA slab protects the pack better, a consideration if I was buying and selling packs.
If PSA ever incorporates packs into the registry I'm not sure you'll see many GAI graded packs at all. It's been almost a year, should've been done by now.
Always looking for Topps Salesman Samples, pre '51 unopened packs, E90-2, E91a, N690 Kalamazoo Bats, and T204 Square Frame Ramly's