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I have the 2012 album that had all the OPs and EDs up to Best Wishes/Seven-colored Arch , which is how I first heard 90% of them, and then listened to the ones after separately. desu, most of the OPs are good-to-great, and most of the EDs are shit-to-good, with a few great ones (like Because the Sky is There, which is the absolute best).
Though, for OPs, Aim to Be a Pokémon Master (original and 20th), OK!, Advance Adventure, Together, Best Wishes, Summerly Slope, Getta Banban, XY&Z, Future Connection, and 1-2-3 are the only ones I really enjoy enough to listen multiple times. And out of those, I don't really have a favorite, so I'll just be predictable and vote for XY&Z. Tbh, I don't really have too much to say, as I've only ever had the time to rank the English OPs, 1-23.