Same. I got into MS due to the DIY nature of the kit about 5-10 years ago. Also an electrician and engineer, so it was just right up my alley. After that, i was just familiar with the setup and Tuner Studio so I stuck with what I knew. Built an MS3X box, customized it with some add ons, but later just did a plug-and-play unit for my car which was pretty quick and simple to get up and running.
From a more wider perspective, the cost of MS is cheaper (not by much anymore), and you don't need to worry about wiring. However, if your wiring on your engine is junk, then that isn't going to help you and you need to buy a universal type MS and wire it in. So could be a wash if you can't run a plug-and-play kit. I do think you can do more things with MS and add on more inputs and outputs to tailor your setup. It's more for the tinkerer, and the dash options for MS are a result of that.
Downside is finding a tuner. Holley tuners are everywhere. MS tuners..not so much.
I usually say if you want to get up and running and don't want to waste time tuning and/or want it done for you, Holley is probably the best approach. If you want to learn the art of tuning and feel like you will want to customize a bit, MS gives you options.
I have absolutely nothing against the Holley setup and would love to play with it. If someone wants to throw a Terminator X at me for free i'll mess around with it, but at this point I'm just gonna stick with what I know and am done throwing money at the car for the most part.
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