In My opinion, yes big amps sound much better cranked up. Back in 1979 I bought a 400W.RMS SUNN Model T tube amp I ran through a SUNN 4 12 cabinet. Once I got that thing passed 1.5 or 2 it SCREAMED!!. Back then I paid $915.00 for the head and $400.00 for the speaker box. Marshall’s back then were much the same, they just sounded better turned up. Again my opinion.
If your dream is like mine was, to have a Hugh kicking amp you may not be happy with less.
But for real and recording, some of the smaller Marshall amps today make great sound, add a peddle and save $1,500.00 and have something that works great for what you really want to do with the amp most of the time.