As with cigars for years I just can't smoke a pipe while I'm working.
I smoke to relax,...most of the time while sitting in a comfy chair following a wee bit of work,....so I'm usually holding the pipe. I like the feel of the slightly warm bowl in my hand.
Besides, there's just something about leaving teeth marks on my pipe stems that I don't like.
So I'm an 80% holder and a 20% clencher.