Are the Thai castings better than the haas ones?
The machines we're discussing are Taiwanese, not Thai, and "better" is a pretty ambiguous term.
Taiwanese iron is fine, the difference is you tend to get a bit more of it for your money, meaning a heavier machine apples to apples. The trade off tends to be less sophisticated control integration and occasionally some questionable design elements. Lots of MTB's buy bare machines from Taiwan and do there own completion and control integration. Hurco is an example of this, although they claim to own their manufacturing in Taiwan, rather than buy someone else's machines - see my conversation with g-coder about that in my earlier post.
For example, we have two Victor lathes. They are 100% Taiwanese, sold through agencies in Europe and the US (They are/were called Fortune in the US I think). They are built like absolute tanks, extremely sturdy and reliable, real workhorse machines. The downsides are that the control integration is extremely basic, heavily relying on standard Fanuc functionality with little to no MTB functions added, and then niggling little fit-and-finish/feature design shortcomings - door window is placed in a stupid position, coolant routing on the turret sucks, tailstock limit switches mounted in a place where they constantly destroyed by chips; Things that in general are not a huge deal, but a nuisance.
From my point of view, I would sooner have a well built Taiwanese machine supported by a known MTB than a Haas.
I have an anecdote about that, that heavily influences my reasoning:
About 10 years ago there was a local-ish turning shop that did production for a big name parent company, they'd been around for years churning out the same stuff. It was determined that their fleet of machines, mainly old Moris, was old and tired and needed replacing. A sweet talking salesman talked them into replacing the whole lot with Haas machines. They were crippled for nearly a year trying to get their existing parts and processes running on the Haas machines, subcontracting all their production (which is how I know about this). People were fired, new people brought in to fix it, and so on until the mothership pulled the plug. The Haas machines never appeared on the UK market, I don't know what happened to them. There were rumours that they were put in containers and shipped to south america, but I have no idea why, or if that's true.
Absolutely no doubt in my mind they'd still be around had they bought Victor instead of Haas.
Another thing to bear in mind, perhaps important, perhaps not, is that the Haas name does not carry the same weight here in the UK as it does in the US. The Hurco will almost certainly retain resale value better than the Haas.