ive an etek4 and i love it, even though i play mainly woodsball/scenario with it, it depends what he wants to do if hes goin down the tourny route then either one would be good, but if hes toying wiht the idea of woodsball scenario still then he could go for the etha due to the EMC kit as then he could add bells n whistles galore due to the rails, if he can he should try both before buying either as then he could make a choice on preference. im glad i got an etek4 as with using a myth2 regualtor on my bottle noticed its silly efficient on air.
hope that helps