Watt Gives?

Why does 75 Belles Watts smoke 250 watts from Anthem, PS Audio and W4S?

Not only do the Belles 75 watts play equally as loud, but it has the best bass texture, grip and slam, openess and top end...

Is this a case of 160hp on a 400lb motorcycle surpassing a 600 horsepower 4500lb in terms of acceleration?

I’d like to go up the ladder but I guess up isn’t always directly related to specs?

Really starting to question analogue / high efficiency, low powered beastly tubes...