I couldn't say, I've played but never owned a Marshall cabinet. I haven't had a traditional, so I can't speak on it. The vintage cabinet was loaded with a cross of Vintage 30s and T75s and didn't have much boom at all compared to Mesa and Orange. The contemporary seemed a tad larger and was loaded with K100s and Vintage 30s, which definitely had more boom to it, which might be the K100s. It's kind of hard to compare, it's been a handful of years since I had them.
The guys at Avatar are very helpful and ship lightning fast too. The cabs are cheap but have terrible resale value compared to more well-known companies. It took me ages to sell the cabs I had.