I used specs as minimal guidance but to decide what to buy i used statistics on users impressions... If they are enough users impression we can draw a "portrait"...
When i had taken the time to do it it worked...
Save in specific synergy case where the specs are not enough and no users reviews can help ...
There is way too much parameters associated with the potential of a piece of gear to be described well in a single review by someone using this piece of gear completely differently ..
I bought vintage products because it is way easier to buy good gear at low price... The numbers of users reviews through time tell all the story...
For new gear people use price tags more as an indicator ...At the highest level of the high end gear they use the specs and the number of zero behind the decimal points ... 😊
In all case acoustics room condition and body measures matter more than the choice between two amplifiers in the same price brackett or not too far of one another in the scale ... But people ignore this because it is way easier to change an amplifier than to change our living room appearence ... And a dedicated room may cost more than the high end system...