I just got a destiny II, am extremely happy with it. It is going to be *my* forever machine
. Babylock offers a "love of sewing" membership that gives you access to all of their sewing instructional videos for a number of years. There are free ones that I watched before I got the machine, all of excellent quality. I've been watching the others since I have the membership now and they are also wonderful. I don't know enough about the Brother machines to say anything about them, from my understanding they are either identical or almost identical. Dealer support is so important, that if you have a dealer that you like or trust better than the other, that might sway you into that machine. As far as I know, I don't have a Brother dealer near me, and I do like and trust my Babylock dealer.
My Babylock is not temperamental, it just quietly sews what I want to without any fuss. It's easy to get a good quarter inch seam with it. I have the Bi level foot to sew on bindings by machine on kid quilts, it works great. I've been playing with the IQ designer part of the machine, it's been a lot of fun.
Good luck with your decision. Hopefully there is someone on this forum with experience with Brother machines who can offer some info for you.
Kathy