Only a little familiar with that Revel model so take this with a grain of salt (as you should with all internet reviews):
The Revels are probably fairly neutral.
The Energys are "warm", ie, some mid- and upper-bass emphasis.
This of course will be at least in part room and placement dependent, but I would expect it to hold true as a generalization.
Which you prefer is, well, up to you. Both should be pretty good speakers, just with a somewhat different character.
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