I have had both and I can recommend both. The main difference for me is the mag release. I like the Ruger's better.
The Walther did have a few FTF's with bulk pack ammo, but with CCI, it was flawless.
im looking for the pk .380
walther!
Not wanting to complicate the Walther-Ruger decision....but I too have an M&P 22. It is a great shooter and fed the 3 or 4 ammos I have used so far which has included 15+ year old Federal bulk (found it hiding) and Remington Golden Bullets, and a couple of others. However, it seems that it is usually at least $50 or more expensive than the others. I have an M&P 9c, so it made sense to me.
I heard a guy talking about recalls or frame issues on the Ruger? That seems unlikely to me, but I was curious if anyone else had heard that...