I tolerated Pegasys much better than Peg Intron.
I've also done both and I also prefer Pegasys. My sides on PegIntron were more severe than they have been on Pegasys.
Mouse
I've used both. I prefer Pegasys. The side effects were less and the pre-filled syringe was easier to handle and more convenient. Some people see it the other way. But, 3 out of 5 heppers would probably state the same preference. That's my take on seeing similar questions over time.