I can't speak first hand about the AEM, but I do own a Holley Dominator. I have found it very easy to use and really love the versatility. I run it on a Gen 4 LS engine with a Holley HiRam intake and dual DBW throttle bodies. Sort of made to look like an old school dual quad set-up. I don't know if AEM can support dual DBW TBs...
I also love the PWM fan control and the versatility of all the I/Os that the Dominator offers.
I've heard that Holley tech support can be sketchy, but there is an excellent support forum with the user community that is eager to help. I also find that if you can find 3-4 buddies that also run a system, then it gets easier helping each other out.
Andrew
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