It's like speaker wire. I was a high end audio dealer about 30 years ago. I sold speaker wire from $1.00 a ft to infinity. Speaker wire will alter the sound of most systems. Which one sounds best? Some are obviously better then others but many people will like the sound of lower priced cables.
Same thing applies to any part of your system. On any day, one amp might sound better than another but in most cases it just sounds different.
Pick what you like and enjoy it. I lean toward the "British" sound and enjoy my system. If you are going to upgrade, be sure you are getting an improvement and not just a different sound.