Since you are considering the 1236T I'd suggest removing the 1228 from consideration. The 1236 is only $600 more than the 1228 and you get a more substantial lathe. If space were an issue the 1228 might be a good choice, but obviously space isn't a major issue or you wouldn't be thinking about the 1236T.
Is the 1236T worth another $2000? I don't know, maybe, maybe not. I doubt you would regret getting the 1236T, but $2000 could also buy a lot of tooling and upgrades.
Don't just look at the specs of the two lathes, also look at what comes with them, often you can find tangible features that the extra money buys. In this case that isn't obvious, and in fact the actual price difference is greater since the 1236 comes standard with features that cost extra on the 1236T.
1236 includes a steel stand, and is available with a cast iron stand for an extra $439, the 1236T does not come with a stand and the optional steel stand adds $800, cast iron stand is not available. 1236 can be upgraded from 1-1/2hp to 2HP for $400, this is not an option on the 1236T. 1236 comes with more tooling, two chucks a 6" 3 jaw and 8" 4 jaw, vs just a 6" 3 jaw on the 1236T. For an additional $400 you can order the 1236 with the Preferred package (1236 PEP) which adds a foot brake, BXA tool post set, coolant system, light and carriage stop. This option is not available for the 1236T.
1236T does have a slightly larger spindle bore 1-9/16" vs 1-1/2" (1/16th difference).
If I were considering both of these lathes (and I'm not) I'm starting to talk myself into the Chinese 1236 over the 1236T which actually surprises me a bit.
I will also note the 1228 also comes with less standard features / tooling (6" 3 jaw, vs 6" 3 jaw, 8" 4 jaw and 10" face plate) than the 1236 which helps close the $600 gap between the 1228 and 1236. The stand for the 1228 alone (not included in price) adds almost $500, steel stand is standard on the 1236.