Was Beta as good as or better than reel to reel?

ANSWER No

Yes, record time was the big reason why VHS won out over Beta. Picture quality was said to trend a bit towards Beta but in all reality both were comparable. Beta tried to trump VHS when it introduced Beta Hi-Fi. Sony reasoned that VHS by design would not be able to make VHS into a full frequency Hi-Fi setup because there was no room between the video scans to layer in full band width audio as Beta allowed. The VHS group just created multiplexing burying the Hi-Fi audio deeper into the tape layer and created heads that could detect and construct the audio. Once that happened Beta was going down. SVHS combined with VHS Hi-Fi was stellar in analogue video record and playback. Super Beta came out and was said to again have a slight picture edge but it was all but over by then... JVC had licensed way more makers to sell VHS machines Sony never did establish a big enough licensee base.

Tape sound quality count on track's width and speed, that is why cassette tape out of the game after CD came out, but digital still can not win all analogs, vinyl still here, VCR has width track but very slow speed, reel to reel tape can only have record time for half hour in 15 ips speed.that will be a big sound different in between

"VCR has width track but very slow speed"

That is misleading. The tape head in a SuperVHS HiFi deck is large, and spinning very fast, so even though the tape itself is not moving that quickly, the speed of the head relative to the tape is very fast. Also, it is writing the data semi-vertically to the tape, kind of like slash marks, in discrete stips. So they actually had better specs than anything else a normal human could afford. Very complicated mechanism, hard to keep them working, and not user-alignable, as far as I know.