Both function fine in my 1911's. I use 47Ds from Wilson and PowerMags from Chip McCormick. If you pressed me I think I'd say the Wilsons are my first choice.
This, except I use the Powermag+. The 47Ds were my go-to mag for a long time, but after trying the CMC PM+, those have become my favorite.
I like the witness holes with numbering and the metal follower, they seat a tiny bit easier when loaded to 8, and the springs are noticeably stronger. Oh, and they're cheaper, to boot!