The early prerecorded cassettes were of terrible quality. No noise reduction, and subpar normal bias tape. The latter ones in the late 80's and 90's are pretty decent quality with chrome tape, Dolby noise reduction and HX pro.
Trouble with buying a used deck, it might need new belts. On some hi-end decks, there easy to find.
For recording, get a good 3-head cassette deck, dual capstan, Dolby B or C noise reduction. Nak, Revox and Tanburg decks are the best, but other decks from Aiwa, Sony, Denon, JVC, Onkyo, Harmon Kardon, etc with HX Pro are also good quality. Depending on what music you want to record, rock or pop music is good for high quality Normal or Chrome tape, Jazz or Classical Chrome or Metal tape. Using this combination you will be impressed at the results.