Looking for NEW amp...would a Bryston 3Bsst output more power than a Krell 400xi amp?

I have a pair of Martin Logan Advange speakers and I am looking for something that will offer plenty of power! The krell 400xi is rated at 200 watts and the Bryston 3bsst is rated at 150 watts, but has a dual channel design. That being said, would the Bryston amp offer more current and power to the logans?

PS. Is there a huge difference in sound between the Bryston 3Bsst and 4Bsst?

thank you, any info is greatly appreciated.

Matt