I would check out the specs of both machines, provided you can find them. When considering a longarm (or midarm), there's more to look at than throat size. Stitches per minute is one feature that I think is important. The Baileys site advertises 700 spm for their sitdown, which is really paltry, and perhaps that's a misprint. The Bernina 440QE does 1000, and some DSM's do 1500-1600 spm, while longarms and midarms are typically much higher. The Innova longarm does 3000 spm. If the Baileys is really 700 spm, that would not be enough in my opinion. I couldn't find the specs for the Janome 18" sitdown.
Have you checked out the Innova sitdown?