In looking at the specs on the product page, your only talking about a 1dB difference in efficiency, not noticable. Also, the difference in power rating is insignificant. For FR your talking 60hz versus 70hz, which should not be a huge difference in low end distortion.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85