I considered both when I purchased the 28BHS (same as the 29BHS) but I preferred the traditional wood joist and plywood floors that the Jayflights have versus the foam and luan sandwich floors of the Jayfeather that have had some reported issues with soft spots and lack of support, and also the larger frames and cargo carrying capacity of the Jfilght. The Jayfeather is considered a "liteweight'' so even though it has the same floorplan there are more differences then just the smooth sides/aluminum siding. That`s just my take on it, there are likely some advantages to having the Feather as well....
2004 Chevy 2500HD Crew Cab 6.0l, 4.10r
2010 Jayco Jayflight 28BHS
Reese Strait Line with Dual Cam
P3 Brk controller