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I owned a Otari 5050blll which I loved after owning revoxb77 teac4010 and a few others throughout the years
and can say the Otari will sound better but the real difference would be in tape handling compared to consumer decks, it is very gentle and first class which is important when your spending big money for tapes.
If it functions properly you may get more bang for your buck by wiring the heads direct out to a tape pre instead of rebuilding the inner electronics, but its your choice. I enjoyed the Otari but sold it and currently use a Sony APP5003.
As far as tapes go the current tapes being produced sound like nothing else, Tape Project,Acousic Sounds,Music Direct all sell great sounding first class packaged tapes one of my favorites is https://www.internationalphonographinc.com/master-tape-copies/
they sell at reasonable prices and will get your collection going fast, and they sound great.
My 2 cents
Pretty tough to compare 747 and X1000R to an MTR-10. The 10 uses a completely different format (quarter track vs. half track) than the other two and plays and records at much higher speeds.
The mechanics on the Otari MTR series are much more robust than the 747 and Teac models, and as one poster noted are much easier on your tapes with their excellent tape handling qualities.
Once you go through the MTR 10, it will last forever in home use. It was designed for constant studio use, so is very robust.
I own all 3, but use each to play different format tapes.