Typically when I hear "infrequent flyer" mentioned, I would always look at a program that doesn't expire with minimal activity, this means North American programs. If you're only accumulating 22,000 miles every year or two then it's quite hard to use them if they expire in 3 years. UA's devaluation is unfortunate, but for redeeming for something is likely to be best, otherwise A3 as others have mentioned for *G.