Tomic will have a better career for me.
His (too?) big self-confidence and willingness to succeed will bring him higher than Dimitrov i believe.
Dimitrov is like the Gasquet of his generation (with perhaps even less potential) : hugely talented but not as driven mentally as some of his peers (Tomic, Raonic, Nishikori).
I agree on the psychological portraits.
Surely guys like Tomic and Raonic already feel like stars and accomplished high level professionals.
They would both try to kill Murray is such a final, while Dimitrov feels more like blessed to be in this position, he'd almost ask for autographs at the end of the match (one day against Roger he actually will, i'm pretty sure, even if he beats him
But this doesn't define a career, not if there are numerous differences in the whole set up.
Daniel Koellerer was the type who'd go through you, while Federer never was (these early career tantrums were smth different imo, toward himself mostly), yet the result is not as the cliche dictates.
These guys are very young and their attitude will be changing along the way.
The good thing is that they are already playing finals and getting tittles, so they already have the level and success just can't escape i believe.
In a Slam final i don't think there would be any mercy or second thoughts from Grigor, so i don't see his natural laid back personality holding him back that much. It doesn't thus far, so i don't see why it should in the future.