Good question. All things being equal (they never are) tapes are better than vinyl because they proceed it and do not require such elaborate equalization (not to mention cutter heads, pressing issues etc.). Time, however can change that relationship. As it happens, vinyl is the most stable recording medium that we know of. The jury is still out on more recent recording procedures.
"Cut from the original master tapes"
this is a phrase I see often when looking at new vinyl of old recordings. I always wonder if this is a good thing. I'm sure the tapes used are of a better quality than the 8 track, casette, or reel to reel tapes that I used but were they really of a quality that they would still be Quality today? Do they not lose their muster, so to speak, like everything that one deems to be from that period of time referred to as "In the day" (yours truly included)?