I've never used a PS-3 but I believe the Oppo compares favorably in load times. The Oppo also plays DVD-As and PAL encoded discs. I only have a few of each of those but it's nice having one player do it all.
I have the BDP-93 which has some shortcomings on the streaming side. (E.g. the Netflix app is old and only does stereo audio.) I ended up getting a Roku 3 to handle all my streaming needs.
Jim