There is a lot of good info here, the sound quality is bad, and he never links to his spread sheet, but I agree with everything he says and he is pointing out the relevant differences. Though his set of tractors is rather limited.
I believe you meant to type ST 242 XT. I can't find a "SD," Husky.
The way the manual diff lock is situated on these would be a deal killer for me.
The X-300 JD line seems too complicated and too expensive for no good reason.
The above link doesn't talk about these, it just talks about the S-100 line.
We looked high and low, in 2021, did my own pro/con sheet for the best value in a lawn tractor for 3 acres, that could pull a cart, with up to 400 lbs.
For me, the choice became pretty clear.
I got a Cub XT2 LX42, 22 HP, for 1,800$ new. I would say my area to mow is fairly rough.
Things I would change up in hind sight: Definitely needed a Diff Lock, and I should have gotten a fabricated mower deck. I also kill the battery all the time leaving the lights on. Other than that, I've been happy with the machine. The controls are all intuitive and I can change the deck level easily on the fly. Its also sort of a speed demon for a mower.