I think you might get more hits if this were in the main reef forum, so I hope you don't mind, but I'm going to move it over there.
As far as your question goes .. I thought, generally, XM bulbs had a more favorable following than Coralife, but, things may have changed since the last time I looked into it. I have a XM bulb but not 400W (so not an apples to apples comparison for you, sorry), I use it on my 20g. I would rate it "Ok." Basically not bad for what I paid for it. Never used a Coralife lamp, so can't help you there.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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