And the big thing is the loader lift speed! The GC is at least twice as fast under the same RPM.:shocked:
The rest of your post has been addressed, but I'll touch on the quoted part.
Unless that RPM was rated speed, it's irrelevant. The BX is made to rev and is rated to do work at 3,200 RPM. The MF GC1710 is rated to 2,600 RPM. MF's more powerful version, the GC1720 is rated to work at 3,000 RPM. If you're comparing the BX to the GC1710, the BX needs to be around 3,200 RPM and the GC1710 needs to be around 2,600 RPM; for the most accurate comparison.
In the end, the MF GC's, the BX's, and the JD 1-series are more similar than different. As said by other posters, it's mostly personal preference and value. The MF was priced between the BX and the JD, when I was shopping, but the local dealer didn't carry the GC and the closest one I found, to look at, was a four hour drive-one way. The local dealer was willing to sell it to me and order me one, but I refused to buy it blind. With that combined to the nearly $3,000 less the BX cost me, MF didn't have a high likelihood of ending up, in my garage. I really wish I could have at least played on one, but it didn't happen. There were plenty of BX's and JD 1-series to try, so that's what it came down to. I ended up with the BX for several reasons. One was the price ($5,000 less expensive than comparable JD) and another was dealer. The JD dealers really didn't get out of their way to help me, like the Kubota dealer I bought from did. A lot of my tractor shopping problems were due to my location. Around here, a 100HP tractor is considered small. The SCUTs are kind of a $20K nuisance compared to a half million dollar sale.
You cannot go wrong with any of the choices, if it will work for you, you fit it reasonably well, and you can afford it. I found used prices were way too close to new prices and bought new, for a few pennies more than comparable used ones.
is the BX perfect? Nope, I've got a few gripes. To date, I have not found anything that could have justified the $5,000 more for the JD and I doubt I would have spent the $3,000 more, for the MF (if I recall correctly, this was for the higher HP model, the GC1720).