I currently have two WASR's, and they like just about anything. To date I have used:
*Surplus blued-steel mags of unknown origin. Several different ones of varying degrees of condition from not too bad to downright nasty. An occasional minor "hiccup", mostly with the worst ones. These tend to be the wobbliest ones.
*Korean gray-parkerized steel. These are my "go-to" mags. I know everybody HATES these mags but in my experience they work great. They lock-up tight with no wobble. They feed ultra reliably. They stand up to all the abuse I can throw at them and they're CHEAP.
*Tapco black polymer "waffle-style" and "slab-sides" (both 20 and 30 rounders). All work well without issue. I know these are looked down upon by many as second or third rate but other than the fact that some of them fit really tight (especially the 20's), I've never really had any major issues with these. I do have to admit that I never buy these. Most, if not all, of these that I have I got from a new rifle purchase or trade or something of that nature. Not saying I wouldn't buy these, they just wouldn't be first on my list.
*Plinker Tactical black polymer. Pure garbage. These were given to me by someone in a trade a while back. I have no idea why I keep these. If the original owner paid more than 50 cents for these he got ripped.
*Promag black polymer. See above.
*Romanian 75-round gray steel. Works well. Hardly ever shoot it. It's a fun piece of equipment but it's heavy and a MONEY-PIT! Looks cool, though.
I live in Colorado so buying any mag online is impossible. No one can/will ship here anymore. I would love to have some of the Russian bakelites and a whole pile of the East-European surplus mags but for now I'll just have to settle for what I can get.