A reel to reel deck is a far more serious machine than any cassette deck. Granted, there are some excellent cassette decks, mostly because people liked the convenience and portability of them. But a cassette was designed for very low fidelity voice recording systems and nothing more. It was only because they caught on so well that audio engineers began trying to improve it into a high fidelity medium.
But reel to reel was designed to record and play music from the begining,. The tape, the machine, the amplifier circuits, everything. Reel to reel was all there was before digital recorders.
I would say that any average reel to reel deck will eat your average cassette deck for breakfast, lunch *and* dinner. And still handily whomp even the best cassette decks ever made.
There is no comparison. Try some recording on your deck, and unless it has some serious problems you will be stunned, compared to your cassette experience!!