The Hammer's change over is smoother and quicker and has a bridge guard vs a pork chop. I always get the feeling the MM is slighty cruder and heavier just from looking at it and touching it, though the weights are very similar. The fit and finish is better on the Hammers I have seen. If I was going to pick one it would be the Hammer but by a very slight margin based on the fact I think I would be just as happy with either (though I don't like the MM's changover as much) I would just get the one that was cheaper. I prefer MM bandsaws to Felder but from what I have seen I prefer the Felder line of J/Ps.
Of all the laws Brandolini's may be the most universally true.
Deep thought for the day:
Your bandsaw weighs more when you leave the spring compressed instead of relieving the tension.