I think it takes quite a bit of research to determine where you actually want to go in Europe. At least the research is enjoyable.
A 4000 ft. plus vertical.
Snow dependability (a base over 4,500 ft)
Trees ( in case there are storms that prevent upper mountain access)
Significant steeps, at least a few steepish runs with grooming.
Out of area that can be negotiated without guides (an additional cost)
There's a number of other factors to consider, I'm sure. But I just concentrate upon the skiing.
A very enjoyable way to go about things is to go "old school" and read books on the subject rather than stare at a computer screen.
Reuter's publishes a guide entitled "Where to Ski and Snowboard". There are several volumes with different publishing dates. The book is the kind of thing that I look at on a midsummer evening ... sorta "coffee table" type stuff.
I've narrowed my list down to one resort ... don't tell a soul. Zinal/Grimentz. I intend to spend a season there before I die.