I use a single hiking pole (staff). It is a Leki adjustible, twist lock with a "handle" that makes it look a bit like a cane. At my age the cane configuration may be appropriate.

I find that I prefer a staff to hiking without a pole or to using trekking poles. The staff helps with balance when negotiating talus and as a third leg when crossing streams. When I don't need it I just carry it in one hand. I got accustomed to having something like this when I did a lot of mountaineering and used an ice axe for much of what the staff now does.

I don't like to use trekking poles because I like to have one hand free. I also don't find that my hiking style is much, if any, improved by using two poles, even going downhill. I've given all of them a good try: no staff, one pole and two poles. For me, the single staff is the best compromise. YMMV. And, I can use the staff to hold up my tarp (oops! grin ).
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May I walk in beauty.