As a few have alluded to, I think the safest method depends on the climbing conditions. On big fir, where the first live branch is 80’ up, I’ll always use spurs and double lanyard. On a heavy leaning alder I like SRT (I use a pantin and ascender). To get around Ivy or pruning certain trees I have a 30’ extension ladder as well as 14’ and 18’ orchard ladders. I’ve never had a problem with spurs slipping, but it’s also the type of trees I climb. On a fir with 4”- 6” cork, if you slip all you have to do is lean back and you’ll catch right away. On a palm or leaning alder this won’t work. Though I’ve never climbed a palm, always wanted to kill a few of those, looks fun. Anyway, for my area I voted spurs.
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