Like everyone here has already a don't buy a CASSETTE 4-track machine, you'll regret it in the long run. The only advantage of having it is possibly getting used to the hands on mixer aspect it offers. Analog does provide more warmth and a richer sound quality, but only if its recorded with a reel to reel machine. Those tascam 4-tracks(I own one) were never meant to create professional sounding recordings, at best lo-fi demo tapes.
Do yourself a favor and save your money for a little while longer and just buy an interface.