I own an Otari MX5050, it's a 1/4 track professional machine that's extremely complex. I've never had any trouble out of it. I also own a Technics 2 track 1500, never had any trouble out of it either. Presently I listen to the 2 track because it sounds better, that would go for either machine, 2 track sounds better than 1/4 track, and 15 IPS is overkill for CD's and records.
My question to you is "where are you going to get the blank tape, and where are you going to get the pre-recorded tape"? Since I've never bought any pre recorded, I can't answer any questions in regard to machine compatibility.
I suggest you forget about the reels until the tape questions are answered. Good luck on both.