The Technics almost certainly has a better transport, and whichever deck you use probably should have its playback electronics replaced or modded. Given that and the fact that there are probably more good sounding aftermarket playback sets for the Technics than the Revox, I'd strongly suggest that (depending on your budget).
The best classic reel to reel tape recorders
Hi fellow Audiogoners - I am interested in adding a classsic reel to reel tape recorder to my system. I have heard great things about the Technics 1506 and OTARI 5050 B2 but am open to all suggestions. I currently use a Revox A77 1/4 track machine. I welcome your timely feedback.