The major differences will be:
1) Work envelope - The Haas has nearly twice the travels in every axis
2) Speed - The Haas has an 8000 RPM spindle, vs 5000 RPM for the Tormach. Rapids on the Hass are nearly 10X faster (1000IPM vs 110IPM). The Haas has 20X as much spindle power. That all means most jobs on the Haas will take FAR less time.
3) Accuracy - The Haas has closed-loop servo control with linear scales, thermal compensation, etc. etc. It is also FAR more rigid. It will produce parts to much tighter tolerance. On the order of +/-0.0002" vs +/-0.001".
4) Cost - The Haas costs almost 10X what a Tormach does (and requires 3-phase power).
As long as you don't require extreme precision (and few jobs do...), and you're not in a hurry, the Tormach will probably do almost anything you want it to.
Regards,
Ray L.