@larstosur In my experience you will get a little more 'control' of the music. By doubling the power does NOT equate doubling the max loudness. In general you will need 10X the power to double the loudness which is 3db. Our ears hear in a logarithmic curve not linear. But is that extra power worth it? You need to listen and make that decision yourself. From there there is many variables between different manufacturers. Most important would be 'current' reserves and how long can they be sustained especially for peaks. In most cases a few milliseconds is fine.
WHAT'S THE DEAL WITH WATTS?
I'm considering acquiring a new (for me) integrated, under $2k, to drive my KEF full range speakers. They are very efficient (93db) , 4ohm and rated for 50 - 200 watts. It seems that a good amp with 80 or 100 watts per channel at 8 ohms will take these speakers to any volume I'd want to experience in my medium sized living room. So what advantage/benefit in sound am I going to get with 150 -200 watts, or more, per channel? Is it worth spending more for extra power that will never really be demanded?