Please let us know what you like and dislike about your PrimeWeld TIG225X when you get it. I have been looking around for a tig for a while... every year they seem to get fancier and less expensive. I am looking at the exact same units you are looking at. I also noticed the 225a @ 40% vs 200a at 60%. I noticed the Primweld was a bit heavier than the Alpha (90lbs vs 69lbs)... so they probably threw a couple extra cement blocks in the bottom of the Primeweld case. The control layout on the Primeweld seems well laid out and very intuitive, more so than the Alpha... but I guess I would get used to the controls on any welder I purchase.
It looks like the Primeweld TIG225X is $775 on Amazon and the AlphaTig 200X is $730 on Amazon + $30 shipping... so really not much difference.
It seems like it wasn't THAT long ago that the Everlast welders were the cheap unproven import welders that everyone was contemplating gambling their money on... with lots of good reviews and lots of horror stories.