This discussion has been on other parts of this site.
A big reason for a CUT over a skid steer or track-steer is $$$$$ A small to medium size tractor is less expensive. The 56hp Bobcat S185 I know about, because I use my buddies; $25k with a bucket brand new. Also, pto equipment is less expensive than hydraulic equipment used on most skid steers.
There are differences in how you use the two styles of tractors, which is hard to explian. A skid steer or track-loader can do pretty much anything a CUT or mid sized tractor can. It does it differently though, and is hard to explain without seat time.
Having this 6000lb beast here at the house right now, I can not use it(s185). It is an awesome machine, but not in wet condidtions. Right now, I stick with my 2000lb Kubota.
I personally am sold on the tracked machines. Not the add-on grousers, but the rubber track like the ASV-RC30 and RC50, CAT-247, and some of the Gehl. I have used the ASV-RC30 and CAT-247(uses ASV track system). They are awesome! I have used the 6500lb 60hp CAT in very wet condidtions. It worked great, with little extra damage. A regular skid steer would have made a big mess, and been stuck(been there, done that).
Anyways, a probably the biggest thing is $$$$$. Otherwise, my little Kubota would be gone and I would have an ASV-RC30.