Wall-mounted or handheld whiteboard for undergrad work

I know many professors and PhDs like doing their exercises on a XXXL size chalkboard or whiteboard. But they mostly work big complex problems. For things at the junior/senior undergrad level, is a 4-6 ft long wall mounted board useful or overkill? Most proofs are 1-2 pages long which should comfortably fit on a largish (say, A3 size) handheld or desktop erasable board. Asking because I went to the glass shop for a toughened glass handheld board and they also had nice big glass boards for the wall.