yea, honestly it really doesn't matter. in terms of function, they're both exactly the same. there's little things here and there that might push you either way though. the apex'i one has a "built-in A/F gauge" but all it really is a LED light that either lights up red or green... the Greddy one plays little beats, but it gets annoying after a while. i hear the greddy one is the easiest to get to work with a car alarm though...
i chose the apex'i one based solely on looks over the other brands out there...
check ebay