Very subjective indeed. Depending on the room, I can make a lot of combos work well enough for the job at hand.
Lowest power: Fender 50 watt Bassman 10 (4-10, heavy!)
Great tone, as long as you like mids with your mids and highs, from this '70's silver face combo. When I go out for a walk with my wireless I find it sounds pretty decent despite being a little bass lite on stage.
A tiny bit more power: Trace Elliot BLX-80 (half the weight, a fourth the speakers)
A bit more bottom heavy, and I end up biasing the tone upward a touch. Does not seem to have as much power as the Bassman, a little fuller in the bottom end (and perhaps a little muddier) than the Fender BassMan. The tone fits well with the rest of the band though, and that's what counts.
Light weight and cheap: Roland Cube 100
Models a bunch of amps, does an ok impression of the Bassman. Sounds OK, and a friend could not believe I was pumping out so much sound from 100 watts at our NYE gig. Stage was boomy so where I was standing it sounded muddy (and loud) as can be. Out front, on my 20 ft. leash, it sounded like a Bassman and balanced well withthe drummer and band. In a noisey bar, playing in a cover band, amp modeling sounds just fine (my opinion), so no point in hauling out heavy vintage gear. And for what we get paid boutique is overkill.
Heavy and cheap: Fender M-80 Bass
Old gray carpet coverd workhorse. Like the old grey mare, it ain't what it used to be. Sounds more like an old Peavey combo with every passing year. I've used this one for a lot of gigs, but have now retired it to the practice garage. At 100 watts (160 at 4 ohms) it is plenty loud enough for the small to medium bars we play.
So there are four impressions from the other side of the tracks. Now back to talking about the good stuff - Eden, Genz Benz, etc.