The LS snowblower will cost a bit more, but it is specifically built for your tractor. With that in mind, if you ever wanted to sell it, you are limited to only someone with a 225S.
The rear 3 point type can go on essentially any tractor with a 3 pt and PTO.
The front blowers are easier to use vs. having to look/turn backwards. In my personal opinion, I would never get a rear facing blower, but I have back and neck issues that cause a lot of pain to turn around like that.
I don't think there is any big difference in performance, but I could be wrong.
I vote for the front mount LS snowblower.