ss multi-ch. amps vs multi seperate amps any adv.

Bulding a ss 5 ch. Surround sys. Is there any adv.to sep. Amps vs multi-ch amps? Ie like a parasound hca 1200 for front another for rear and one bridged for center vs something like a 1200a 5 ch ss amp.will be using a b&k referance 30 processor. Assuming all power is equal what's the diff?