Like Hendrik said, depends what you want to do with it. I think a 5 ton machine is perfect for small excavation work because it can fit in to almost anywhere. They are also extremely easy to transport. A lot of people are surprised what a 5 ton machine can do, they are quite versatile. Here are two videos of our 5 ton Bobcat doing things that i didn't even think were possible, until i did them. haha
Discuss this in the forum topic Mini Ex Vs Biger Ex.