you can find extensive discussion on this topic at
www.rimfirecentral.com.
With what I've read over there, you can find some for a pretty penny by Tactical Innovations. Every person that has one seems to be happy so I'd have to say they are the "best". I have a Buttler Creek Steel Lip 25rnd magazine. After finding a plastic bur I had to shave off, it's been 100%. Biggest gripe for most people are 10/22 magazines that have colored (red,yellow or whatever else you can find now) plastic feed lips/ramps because most don't have the extractor on the magazine leaving the secondary extractor on your rifle to do the work.
Hope it helps.
Tom