The only cassette tapes that I ever found to be good enough for my ears were metal tapes, but boy were they expensive!
My mum used to work for BASF back in the day so I had bucket loads of their CrO2 tapes in the late 80s and early 90s for really cheap prices. They were pretty good as I recall, but no match for metal in side-by-side comparisons using a decent dual capstan, three head deck. I would say "those were the days", but generally speaking I disliked cassettes. Mind you, I still have a lovely, immaculate Aiwa AD-F810 in the rack which is great to look at but never used. Perhaps I'll give it a whirl again at some point.