I seriously considered all three. I think there all good in their own way and seem to have many happy users.
I personally chose the Tormach because:
1) It was the least expensive machine whose table travels fit in my needed work envelope. This is very important to consider. The table travels Syil (of the X3) would have worked for 80% of what I wanted to do, but not 100%. Only the IH and Tormach mills would have done everything I wanted.
2) I wanted a VFD, with the Tormach I got one and didn't need to pay extra.
3) I liked Tormach's website, professional documentation and its coherent and well thought out line of accessories and software. Plus every Tormach mill comes a spec test sheet filled out at the factory, which is a little something extra I can appreciate.
So for me I could have been happy with any of these 3 mills, but for my purposes the Tormach represented the best value for my work envelope. I have no regrets. I still might purchase a Syil X3 for my basement shop, just because its size is manageable.