Ask yourself
'How much of Europe do I need to be loaded onto the GPS device'
I don't want to make your mind up for you, but you can get a lot of info on the Quest, and if you're just touring France - do you need spain / scandanavia/germany etc.
If you're touring in Italy, you would only need the maps or the immediate area of your chosen route to Italy, and then the maps of the actual area that you're exploring.
So you may find that the Q1 has sufficient storage anyway. As you just load the maps you need before your journey.
If however you are travelling far and wide, then you ,ay need to load more of Europe, and that's where the Q2 would win.
I used a Q1 for touring France last year and it was fine. I'll use it this year for a planned trip to the Swiss Alps, So I'll include England (South Coast), French / German roads along the rour route, and the all of Switzerland, and the bordering sections of Northern Italy.
If I need any more than that the basemap will get me from city to city without a problem.
I hope this helps