prtfl.io is much more polished—it shows that it wasn't built in a weekend. Please launch soon! After looking at prtflio.eu, I wouldn't worry too much about brand dilution—it's not even in your league.
How many times does Paul Graham have to say "just launch"? Launch and iterate, iterate and then iterate some more. Talking about brand dilution on an unlaunched product is a moot point to say the least.
I'm not taking sides about what happened here, it seems murky at best, but you can't compare an idea to a product.