Bench = best single compound excercise for chest.....you're neurological and muscle response with regards to pec/delt/tricep development is unsurpassed
As for Hammer vs Bench.....are yu kidding me?.....its a non-argument.....people tear pecs because they do singles and overload the bar....fucking ego-warriors....what, 6 reps is considered high reps hey?.....lol.....Arnold, Sergio, Nubret.....gods with chests from the heavens.....how do you think they developed them?
Bttom line -----------> show me someone with the good fortune to have years of benching Vs a hammer strength pirate, and the quality of development will be day and night.