The Walkabout is a great head. It has a few oddities (no mute, DI is post master-volume, no Speakons), but if you want tubiness in a small head, that's the way to go (or a Streamlimer IMO).
However.. the 15" Scout Cab (caveat - I've only played the 12"):
The 12" combo is great for the old-school vibe (nothing Wootenesque), but it's a bugger to carry around.
I imagine the 15" is a ) even harder to carry around and b ) is overly flubby, even less capable of nailing anything Wootenesque.
All IMO, of course.