you should not place the CSB under a counter when ' Cook'n '
that's my take the steam outlets on the back top will eventually ruin your cabinets.
I also have both. it took me a while to take the SteamPlunge
Its well worth it to me. size matters but not that much in relation to the quality of the CSB's output.
I use my BVXL now just for brownies ( 13 x 9 or so aluminum pan , edges crimped a bit ) and
Tj's fz pizza or other larger pizza that fit in the BVXL and not the CSB
Im sure Cuisinart chose to make it as it is based on its foot-print alone.
eventually you get a few pans that fit in the CSB you don't need many.
the 1/4 sheet pan is a game changer before you try out a CSB and of course the additional expense ..
after you try the CSB , you completely forget about the 1/4 sheet pan.