I have to correct myself here after some thinking. Half my family is Polsky/Uky so I grew up with disparaging ethnic jokes- and being an ex soviet bloc country I figured low tech, but that is a generation ago and I should give the EMU a second look. Features that caught my attention were the strong safegaurd skew on this ecu. Did you get to have a peek inside, what was the quality of the unit like? the kit that just has the connectors and pins allows me to reuse the $300 Vems harness if I chhose to replace- my thinking also is down the road if I have to revisit the Vems, how difficult is that vs another ecu.
Yes I did take a close look at the hardware on the first one I used. I'm no electronics expert so cant comment on things like routing and general layout design etc, but can at least say to me it was a very clean and professional looking PCB. All surface mount components and all components were square and properly aligned etc.
Since you mention polsky family - it might be worth me mentioning ecumaster actually also sell a "polish only" version quite a bit cheaper than the English version (my understanding is the "PL" ecu is locked to the polish software and that only installs on polish windows).
The VEMS will probably be a little more difficult to work with for a beginner - with the very little/poor documentation and not much support from the manufacturer there will have to be a lot more "learn as you go". Having to learn a little isnt always a bad thing but it helps a lot when you've got some good documentation and support people to bounce questions off...
I don't have any experience with the Holley that you were considering, but can give some superficial comments; specs look ok on paper, i/o count is a little low but ok for your application - enough for fuel pump, fan, boost control and that's about all, the software seems a bit odd but is probably aimed more at beginner users so would probably be easy to learn with, documentation appears to be quite complete.