a good reel to reel in theory should sound better than a record .because before the record was made it was mastered on tape .
No offense, but this has NOTHING to do with which format is better. If a given recording was originally made on tape, that is what you start with, for ANY sort of media distribution. The question of whether reel or vinyl sounds better has only to do with which will be truer to the original source, and then of course, the quality of the playback equipment. And there is also the matter of how the LPs or consumer tapes are duplicated. So it can be a complex question to answer.
Further, Reel to reel has lots of "sub-formats". There is the width of the tape, the number of tracks, and the recording speed, all of which matter. Generally, reel to reel has better technical performance than vinyl, and has the potential to sound better - even MUCH better than vinyl. I have quite a few commercial/consumer reel to reel tapes made at 7.5 ips that sound as good, if not better, than vinyl. That said, consumer reel to reel tapes that were recorded at the lowest 3.75 ips speed almost never sound as good as vinyl, to me.
Then there is also the fact that there is still very widespread new vinyl production, and only slightly more than zero new reel to reel tape recordings being released.
FYI, I am a huge fan of Reel to reel. I love listening to reel and have been collecting prerecorded reel tapes, the vast majority of which sound terrific. But it's not a cheap hobby.