Amp or DAC?


I’ve wondered about this for a while and was hoping for some opinions: 

Let’s say I compare the same company’s 75w into 8 amp and their 150w into 8 amp. Will I notice a difference in sound quality? If so, why?

If there is a difference between the 75w and 150w per channel amp can I narrow the gap or even exceed the 150w amp by using a better DAC?

Also, has anyone noticed that a lower watt amp has less distortion than a higher powered one, so throwing my understanding that the same manufacturer’s higher powered amp should be superior to it’s lower powered one out the window?
cd45123
I have no idea what you’re running but a well implemented purifi or Ncore class D amps will better most AB amps in noise except the Benchmark AHB2. Your DAC, even ones that don’t measure state of the art should have less noise than good SS amps. I wouldn’t worry about the watts to much unless your speakers need more power. I have 500w class D doing bass and 2x250 W class D on mid and tweeter in an active speaker and I never have any problem with noise.
@djones51 it was a Purifi compared to a Hegel H90. Great clarity/quickness with the Purifi, but didn’t notice any more ‘control’ of the woofers from one vs the other. 
Have you compared an AHB2 with your class D amps? 
No never had the Benchmark amp. Not sure what you mean by control of the woofers, what speakers.
I tested them against two bookshelf’s - LS50 and Unifi UB5, since these are supposed to be somewhat ‘hard to drive’

I just meant bass response 
cd45123, I had class D amp and currently have AHB2.  Both have excellent bass control but AHB2 has a little bit better extension.  I cannot explain it, since on paper it is only few Hz difference (5Hz vs 0.1Hz), but it is audible (same source, speakers, room).

From the point of membrane damping output impedance of the amp has very little effect on it and anything above DF=15 should be fine. 

AHB2 - is a wonderful amp - dynamic and clean, but don't expect "warm" sound.  It was designed to be accurate.