Let's say I have X dollars ,what to buy; for the same price Japanese or American and most important why?
By the way I live in Europe so I have to pay taxes
No offense intended, but some european makers gained some very positive reputation in the last years.
Some names that come to my mind in no special order:
Catcheside, Dahlmann, Raquin, Antzenberger, Xerxes, Tilman, and many others.
Also there are some oz makers that are worth having a look at.
Robert Herder's 1922 series are extremely thin where it matters: right behind the edge. Hardness 60Rc.
Dan Prendergast would be my choice for semi-custom. http://www.prendergastknives.com/
I have a knife from Dan I am EXTREMELY happy with.
I also just bought a petty from Lew Griffin who's pretty much unheard of on here as far as I can tell. Monosteel 1095. It's excellent and I will be trying to get his name out on here as I think he's a maker more people should be looking at. He's over in Ireland.