World of difference there. I'm currently driving a Euro and for what it serves, I love it. Simple auto transmission, gets me from here to there and no hassles from the car or from people. I don't miss fnf hero's looking to gain street cred at the traffic lights, falcodores tailgating and the cold glare from the boys in blue. The Euro is alright on the road but will never see the race track. I'm still not use to the nose pitching so much under braking but it's not as much as other cars in this class. Running costs on the euro is much cheaper naturally.
If I were to get a GTR again it would be for the sole purpose of tarmac rally or club racing. If you've still got the car mod bug then get the GTR. I don't see the point in modifying a euro, it was never intended to go at speeds. If you want a balanced and stiff chassis then the GTR of course.