Once you are down to final choices between “good and good” and there are no clear winners then the only way I know to decide would be based on your phone calls with each manufacturer and the criteria of your personal value equation that were most important to you. I think that post #2 here which dealt with similar questions may also be helpful
All the documentation for the Reverie 5D (Deluxe) says 300 lbs per side but when I called to ask them two years ago they sent me an “official” email which confirmed that each base will hold 550 lbs (see post #2 and #3 here) and they would honor the warranty for that amount. Since that was sometime ago and Gail no longer works there I would call them and ask them to confirm this for you in writing for your own peace of mind.
The weight limit for the S-Cape adjustables are 450 lbs for the DC motor and 600 lbs for the AC motor per side.
The weight limit for the Ergomotion 400 is 400 lbs per side.
The side pads on my Reverie Deluxe (5D) are polyfoam and this would be the norm for adjustable beds that had side padding. I don’t know the type of fabric in the skirting.