Scola is technically south american, not european. Even though like 95% of all Argentinian and Uruguayos are of recent desent from spain/europe.
Definitely Scola. Nearly 10 years in the Euroleague playing for Tau Ceramica and Gijon Balencesto, both Spanish teams. 2 time Spanish league MVP and 2 time All-Euroleague 1st team. Spanish league Rookie of the Year. Definitely Scola! "Luisss Scooooolaaaaaa, my friend from Argentinnaaaaaa!" (In a Mutumbo voice)
<a href='https://postimg.org/image/ciykgi7vz/' target='_blank'><img src='https://s3.postimg.org/ciykgi7vz/lloyd.jpg' border='0' alt='postimage'/></a> Oh wait. I thought you mean best Euro STEP in Rocket history.
Gonna have to be more clear what you mean by "Euro" if you go ahead and pick a South American as the best "Euro" in the op...