I never thought River was that hot. Joaquin on the other hand? There's something about him I find attractive. I think River looked like a undernourished kid from the wrong side of the tracks whose parents just might have been cousins. I think Joaquin is a strapping, wholesome dude (for a vegan) who looks like a man. Or, maybe it's just because he has a larger body of work than his brother left behind.
In terms of talent, I think Joaquin is a fine actor, loved him in Walk the Line and Gladiator. I think Phoenix would have had an outstanding career and probably would have developed into one of his generation's most accomplished actors.
But still, looking below, I'd still say Joaquin got the better end of the deal in terms of genetics: