I was also contemplating the juki and the janome 7700. I personally chose the janome for a few reasons.
1. I don't use a foot petal because of my back I just use the start/stop button and the juki didn't have that.
2. I sew garments as well and wanted some of the other stitches for garment construction.
I was very happy with my choice and found the janome 7700 for a great price right as the 8200 came out.
Have fun with whatever machine you choose!!!