I was looking at the same comparison (though less the backhoe) a while back when I thought I was going to end up with more land than I purchased. (now looking at 3830 vs 1540) I had some seat time on both and like both. I would go so far to say as performance specs go, in most conditions you would never realize a performance advantage either way. Said another way more simply, you should be able to do the same tasks with either one. Of more importance (in my opinion) is the dealership service/relationship, operator comfort, and price difference (which you didn't mention).
Sure there are pros/cons to each machine. For example, I liked the seat and room of the 4630 platform better than the Massey, but think I like the factory installed FEL joystick on the tractor (1547) better than on the loader (4630).
When it really gets down to it though, you will adjust to the specific features your tractor has. Just make sure you get the big things you have to have.... Some seat time in each should help you decide what is best as well. Have fun shopping...
As for me, I will take a 3830, with a curved FEL (a la Deere) a fender mounted joystick (a la New Holland) all painted Massey Red!
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Rich