Alternative amplifier strategies for 83db speakers?

greetings from CT.

Is higher wattage worth the trade off of adding more channels or bridging channels?

For my 83db efficiency speakers, Mirage M3si, I am currently bi-wired with my 2-channel Adcom GFA 5800.

This puts 250wpc to 8ohms and 400wpc to 4 ohm. My speakers are 6ohm.

Generally, is a standard 2-channel amp like my Adcom superior to an internally bridged 5-channel amp which may put our 300wpc but obviously be more complicated in design? For reference, a Classe CAV-150.

What about a 5 channel x 200wpc amp with 200 watt channel to each of woofers (x2) and mid/tweeter (x2). 4 channels x 200wpc, For reference, a B&K 200.5