It depends, I think. I've owned a PJB rig that was a Suitcase combo plus an extension cab (350 claimed watts, 8 x 5" drivers)...I'm sold on 12" "super cabs" now. I bought a 1x12" from AudioKinesis and it's probably all I'll ever need. Weighs 30 lbs, sounds like a dream and almost puts me in 4x10" territory in terms of loudness.
I have an Audiokinesis Hathor 1203 and like it a lot -- my previous loud-yet small one-hander was my Markbass CMD-121P combo (I've also tried the NY121 cabs) and, side-by-side, the Hathor is a noticeable improvement in depth, clarity, articulation, focus, dispersion of high mids, cohesiveness of sound low-to-high... just a more impressive performer all-around. The Markbass is no slouch -- worked well in some loud, busy mixes and got louder than it had a right too -- but the Hathor will do that while sounding fuller and more focused and retaining some authority in the low end.
I played the Hathor side by side with the proto MAS 18. The MAS goes deeper (indeed, might be the deepest bass cab I've heard to date) and, with the optional tweeter, higher (both cabs have a mid/high driver). The 18 presents as more full and leaning more towards the hi-fi, the Hathor more towards the upper-mid-grindy, but both are well-balanced and versatile cabs. I felt like the Hathor would edge the 18 in max volume, but I didn't max out either (though we did push each pretty loud). The 18, though, will beat a lot of widely available commercial 12s. Don't sleep on that cab.
I heard a Crazy 8 and Crazy 88 years ago, alongside a couple of early MAS 25s (2x5”). Each was impressive in its own regard and I wouldn't sneeze at any of them if offered to me as a compact rig but, with electric bass, if playing with a drummer, for me, the MAS 18/28 would be a clear step up - I just found them to be more confidence-inspiring at volume.