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I've quite briefly owned a M210 in the past and never got much use out of it due a several month run of horrid seeing and then moved onto a M250. I cannot say much about a visual comparison between the two but I've always been impressed by the views out of the M250 when the seeing cooperates.
My reason for wanting the M250 was to have the potential to do imaging (which is mostly what it's used for right now) although my original purpose was to use it for planetary viewing with binoviewers. I also wanted the electronic focuser which incorporates a non-moving primary mirror.
I'd say that the benefit of the M250 over the M210 is better mechanics as the difference in aperture isn't that dramatic.
In getting that extra aperture and mechanical design you do pay in the weight department... I'd estimate that the M250 is twice the weight of the M210. The M210 could comfortably be used on a HEQ5 where as the M250 requires the EQ6. If balanced the EQ6 or AZ-EQ6 works fine with the M250 but the dampening on the stock tripod isn't that great.
It's hard to fault the M250 though, optically it is excellent! I've done a LOT more imaging with it than visual but I've comfortably been able to get unguided exposures with FWHM close to 1".
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