Seat Choice - RIB vs Smartbed

[TEB]

I'm soon to be getting my T6 converted (first time). I was originally looking at the Smart Bed Evolution on a slider. The garage doing the conversion have suggested the RIB Altair as an alternative (no talk of slider on this), mainly because the lead times on the Smart Bed Evolution is pretty long right now, but they seem to think it's a just as good (better?) option.

I'm hoping to get some opinions on how these beds compare to one another – specifically comfort when sleeping and headroom when in driving position. But any other thoughts welcome.

Thanks
T