See which features the Juki has the Brother doesn't and vice versa. I've read on another group that the Juki has a needle up/down that the Brother doesn't (at least this is what I remember) and I personally love that feature. I personally wouldn't buy a frame if I couldn't set it up right away. I say this only because I was given an original Grace frame that they have since discontinued and replacement parts/upgrades are not available and they are constantly coming out with new frames so I'd want one that is a current model. Also take a look at the Janome 1600 which also has a 9" throat. I have none of these machines but have researched all of them for someday.
Suzy