I work with a volunteer organization as a trail maintainer, and as a trail maintenance supervisor for about 50 miles of trails in a NY state park. Last spring I took a chainsaw safety training class so I am permitted to use a chainsaw in the state parks to clear trails. I also fix small engines as a hooby/side business, and have started maintaining the saws for a number of our volunteer sawyers. A lot of our sawyers like the homeowner Stihl saws like the MS170 for the weight factor.
I do know a couple trail maintainers who use the climbing saws, and I considered an MS200t when I started, and actually had one I picked up cheap on CL. Where I like the size, weight, power, and shape of the climbing saw for carrying, I didn't like the way it handled for cutting on the ground. I have had a fair bit of practice with a chainsaw, but can hardly consider myself an expert, and I find the stability I get with a rear handle to be worth the added hassle carrying it. The real draw of the MS200t is the power/weight ratio, and it really is a pro level saw.
Personally I have gotten most active since hurricane Sandy, and have been going out with my 026. The 026 is more than you would need for typical trail clearing, but with the huge amount of blowdowns post hurricane Sandy the extra horsepower and larger bar lets me get through more wood in a day out. Typical storm damage around here is a downed tree or three in a pile, but post Sandy there have been piles of 8-12 trees, and that kind of mess would get tedious with the MS170. We had one section of trail with around 70 trees down on one mile of trail. When we get caught up with the Sandy mess I will probably switch to a smaller saw, when I will be spending more time carrying, and less time cutting on a day out. For a smaller saw I am liking the Stihl 012 I picked up in a garage sale, if I can get it to stop leaking bar oil. If I can't get it to hold its oil I will probably end up carrying the MS170 I picked on CL last week (yes I have CAD, 012, 020av, 026, 038, MS170, MS201t, MS250). One downside to the 026 is the tank vent leaks when carried vertically, so I have cobbled an MS260 tank vent onto it. Would love to find a cheap MS260 Pro, but haven't found one yet across one yet
My chainsaw trail pack is a Kelty baby carrier which works great to hold the saw securely for hiking over rough terrain. Seeing this post finally got me motivated to take a few photos of my rig, and I will post them in a new thread here as I have been meaning to for a while now.