Rope of a different 'color'
9 years ago I was climbing on 9mm dynamic rock climbing rope because I came from that world, and in entering the tree care industry, I never really had anyone to tell me any better. My first arborist rope was New England's High Vee. I couldn't understand how arborists could climb with such a heavy, bulky rope, but I had worn out my kernmantle rock climbing ropes and the arborist ropes looked more durable (and they are).
The High Vee lasted until I touched it with a saw, so I went to find a 7/16" arborist rope. I only found 1/2" at the time, so I went with it. I bought two ropes at once, True Blue and Blue Streak, and tested them against each other for about a year. Next I tried the Arborplex, then New England's Braided Safety Blue, then (remember, we're moving along in years here) some 12 strand and then another 16 strand I hadn't tried. I have a lot of retired ropes in the garage.
What I use now, what I've come to appreciate more as a climbing line than any other, very durable, great abrasion resistance, soft feel, takes knots well, ascender friendly, rappells well, 10,000 pound breaking strength..... I'm not sure if you guys are ready for this.... Sampson's 1/2" Stable Braid. It's marketed as a bull rope (static vs dynamic), but I think its a truly great climbing line.
Climbing lines, by convention, are supposed to have some stretch (dynamic), so if you fall, the elasticity of the rope will absorb some of the shock. In the rock climbing world, it is expected that you'll take an occasional fall. Not so in tree climbing. Falling is not part of our sport ; A fall is an accident. Any fall, in my eyes, is always a bad thing whether a dynamic or static rope is involved. This is why you set redirects if you have to climb up above your tie-in point.
I like the non-stretchyness. I don't like to 'bounce' when footlocking. Many of the available static lines are very hard, very stiff, don't take knots well and get even stiffer when the weather gets cold. Stable braid, however, is supple and the feel gets better with age. The sheath doesn't stretch so you don't have the problem of the sheath 'milking'. It's very hockle-resistant and at 10,000 pounds working tensile, I feel very, very safe on it. After I retire it as a climbing line, it becomes my new lowering line. I'll continue to buy and test new ropes as they come on to market, but for now, as strange as it might outwardly appear, the 1/2" stable braid is the rope that rocks my world.
OK, now I'm ready for the 'Grill'Committee'.