I like Bernina 930, it has a few stretchy stitches, strong motor, and is everything I ask in the basic machine. It runs and stitches nicely. The Pfaff has the built in walking foot that comes down in the back of the walking foot, I guess that's the only advantage I can think of. I don't bother too much with autofunctions like needle threader. Both are good machines.
I know a few who have had their 930 in for repair, and if you find the right repair guy it will most likely be possible, and price within reason. I guess the same for the Pfaff. There's a tad more electronic in the Pfaff than the Bernina in this particular case, but it might not matter much. The 930 is made for the user to clean and maintain to a higher degree than the Pfaff, and it's always a pluss in my point of view.