To me, there really is no comparison between tractors and skids. There are some days where I think having a Deere 110 or a Kubota L35 would be nice, being able to take just 1 machine to a job and handle it all with 1 operator. Most jobs anymore our 216 and 303 end up on site at some point, we try to steamline our hauling operations with fuel prices, but it would be nice to have just 1 machine to handle most tasks. The really harsh reality is that an excavator will do 3X more work than the backhoe mounted on the back of a tractor, but it came at a cost. If you can afford both a skid steer and a mini excavator, there is no reason to own a tractor. Aside from that, there is no way a comparable size tractor would ever be more productive than a skid. They might be more versatile, enabling you to run across lawns easy and since you can get the same attachments as a skid steer you can argue that they are basically a swiss army knife, they can handle it all. But when it really comes down to getting a lot of dirt moved, tractors just don't keep up. We have a Kubota L3410 tha we use in the orcard and at our supply yard to load mulch, topsoil, etc.. We've had it 2 years, we could easily load it up and take it to a job and yet it never leaves the yard.