Of course, the easy answer is 'both'. But that's easier said than done.
I keep discovering that it is very challenging to upgrade/tweak my system and make equally significant improvements in both the quality of the tone and the details retrieval. Usually the tweak/upgrade is asymmetrical. Either it improves the tone of the system, at the expense of some details retrieval, or the other way around.
And it's not only me; I've noticed similar trajectory as I'm following upgrades/tweaks that my buddies are making. Some of them tend to lean more toward favouring detail retrieval and are okay with sacrificing some of the tone density and thickness, others are more into chasing after lovely tone, even if it means some of the finer details get lost.
I'd be curious to hear what others on this fine forum think about this issue. Or, maybe it's all just a figment of my imagination? Maybe all power amps sound the same?