Meh. They are all close enough that it comes down to personal preference. Any of the three can shift really well set up properly.
I like my Force, but that's because the thumb tab for Campy is WAAAAY too far back for me, and I like my brake to just be a brake.
SRAM in decline? I don't see that. They've been around for road bikes what, 5 years? That's great market presence in a short time.