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well typically the best thing to do is go with the one the guy whos working on it is familiar with or recommends.
most ecu's are basically the same, some have better features than others, prices vary, software varies in quality, but none of it matters if the guy installing and tuning it has never used it.
if MWR say go with the AEM and they can make it work, go with it, as i said before since i have no idea what they're intending to do i can't say if it'll hit a problem, but they ought to know, and if they run into issues they can solve it.
Just realise that if its the first unit being installed in a lotus, any unforseen problems will be just that, unforseen, but liek most things its just better to be comfortable with the tools and tech you're trying to solve for.
the EFI usa doesn't have anything magic that makes it work, its basically the same as the one thats in the lotus in the first place, its mostly just the software, so long as the standalone supports all the features of the engine, cylinders, ignition, crank signal, vvtli etc then there is no reason it ought not to work, and mwr will know that, if they've put it in 2ZZ-ge cars before then it does support the features.
the bit i was unsure about was how do you feed the pedal position into the stock ecu and then let it controller the DBW independently from the standalone, but i'm sure thats not what they intend to do, standalones aren't called that for no reason.
talk to rob about his can bus adapter too, he can probably knock you up something to control the dash from the aem, look in the 2007 to 2008 cluster conversion thread thats recent.
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