During their time on the Washington roster this season, they're pretty much statistically identical.
Like some arguments we have, this goes beyond statistics.
For Example of last nights performance and A certain Hanrahan weekend:
Sosa came in for an inning and gave up 6 runs... Over the season here that adds up his era for ONE GAME, thats one game worth of damage.
Hanrahan came in for 3 games and blew each one on his own giving the Nats 3 losses.
3 losses to 1 unreachable win.
I'm just giving a crappy example but I agree with you, they're both destructive to this team and we should get rid of Sosa like we did Hanrahan. (well not trade but just DFA his ass)