For years I used a pair of Leki cane style T-grip trekking poles. I used them, mostly, for crossing streams and to save my knees going downhill. But they are an annoyance. Whenever I needed to use my hands for something, the poles were just in the way.
Two or three summers ago I decided to do some testing, I bought a few pairs of regular straight trekking poles in addition to my cane grip. My cane grip poles were my first trekking poles and the only ones I really had a lot of experience with, so I wanted to see if I was right that the T-grips were more functional and if trekking poles had any performance advantage. I did some timing with and without poles and just did short local hikes with and without poles. I concluded that trekking poles were more trouble than they are worth. I went pole-less.
I don't seem to be as steady on my feet as I used to be. I recently took a bad fall. With the huge snow pack this winter, all the streams are running strong and I miss my trekking poles whenever I need to cross a stream, and my knees are taking a bit of a beating.
After my testing, I decided that straight poles were probably better for going uphill but I still felt that, overall, cane grip poles were superior. But my old Leki needed an upgrade. The twist lock pole sections weren't very secure and the grips could be a little more ergonomic. So, I ordered some new, improved Leki cane style, T-grip trekking poles.
I'll let you know how they work out.