The answer to the question really depends on what your doing with it, how important is the productivity level, and mobilization of the machine . If you have a 10' stick on the 160, the reach is practically the same. The 160 is narrower so you lose some lift over the sides especially. If you can move a 210, then go that way, but I dont think you can with what you listed. I am not convinced you wouldn't be over with a 160. The 210 has more lift capacity so you can run a bigger bucket, and lift more. The question becomes if bucket size matters, given the use, I would say not. Could you handle bigger trees, pull stumps a little easier with a 210, yes you could. Does any of that productivity increase matter? How big of trees and how big of stumps do you plan on pulling? If you can legally mobilize the 160 but cant mobilize the 210 and your not doing these things everyday as in working commercially, I would say something 160 or smaller would be fine.
I would rather be able to move the 160 at will without overloading the truck and trailer (or buying a different trailer) and move it legally without sh$tting a brick when you see a temp DOT scale set up while your moving it. Because at the end of the day, your not working commercially, while your time is valuable, taking a little longer does not keep food off the table. So why buy a higher rated low boy to haul a bigger machine, that at the end of the day, really isn't making you money day to day. It is simply saving you from hiring someone else.