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Only using one pole seems a bit limiting in a lot of scenarios TBH I probably use both 90% of the time.
Personally I wouldn't use carbon fibre poles

I am been using poles for a few years now (two knee operations and a hip on the way out) and ALWAYS use the hand loops and couldn't imagine not using them. It's not like I never fall over either ......

I use them all the time and they are great for shooting off in high tussock as well