The CC's may have similar or more HP but torque is a totally different store. Torque combined with a larger engine, heavier frame, and more weight equals able to do more work. You can lift more with the loader, pull more with the tractor, lift more with the rear lift, and it will last longer. Many of our small engines, even well maintained, won't last much beyond the 1500-2000 hour mark (some longer, some less so let's not get into that

). But the FA Cubs will last much longer as they are a larger block, liquid cooled, and more I'm sure I'm not currently remembering/aware of.
That being said, the average homeowner not "farming" with the machine will do just fine with a CC or Super GT. Just all in what you need the machine for