Having taken part in an unsighted format test back in November, I actually thought hi-res streaming sounded better than the R2R of the same recordings. And I assumed the streamer was the R2R and the R2R was the streamer!!!
The proper use for a Reel to Reel machine is to record live music, or to play master tapes, or high resolution copies of master tapes, not to record streaming services or CDs, or vinyl records for that matter. What would be the point of that? It's a complete waste of tape. Good quality tape these days sells for £60+ a reel...
Also too many variables for your test: machine quality, type of tape used, age of tape, was the tape machine calibrated, also calibrated to match the tape being used. Without knowing this your unsighted test is completely useless and irrelevant. If you had a known master recording on tape played on a recognised tape machine like a Studer etc, at 15ips (with confirmed calibration of tape and equalisation) of a specific piece of music, then you could compare this with the same piece streamed from your streaming service. Then you would have a more relevant comparison.