Well, you gotta remember that the
Bassman is the designated "premium" line and the
Rumble is the "value" line. Therefore, at least theoretically, an equivalent
Bassman "should", somehow, be better than the
Rumble, right? Well, the
Bassman usually does have more controls and/or connections than an equivalent
Rumble.
I bought a brand new kickback-style 2002
Bassman 150 combo (with 12" Eminence, right below) that really kicks serious butt for it's size, and I still love its tones! So, when I needed more volume, I got a new 2004
Bassman 250 combo (with 15" Eminence, left below). The two, chained together FX Send to FX Return, gave me up to 400 watts thru a 12" and a 15" that is still totally awesome!! And the built-in bells & whistles of Contour, Room Balance, Tuner output, Mute, etc. are great. But these suckers are just too dang
hea-vy for this now septuagenarian. No wonder the
Rumble 500 replaced them on my stages. But they still sound
so good I hate to even think of selling them.

Of course my real darling (other than Mrs. Dog) is my 6-year-old ultralight
cab. Those preamp tubes give some very real old school tones thru that Eminence 15"! And the Class D power amp keeps the head less than 20 lb.s! But, I cherish it too much to take out of the house very much!
At home any one of my Bassman amps can always sound better than my Rumble 500c without any pedals (and not counting the Rumble Studio 40 modeling tones). On a live stage the difference in tone is overruled by the significantly lower weight of the Rumble 500c. YMMV