I use both and also make my own.
The ones I make have an angled side profile and are made to cut on the pull stroke. They are equipped with a handle much like a chisel. They are sharpened and polished like a chisel with an edge that is shaped for the job at hand, curved for hollowed-out places, V-shaped for incised carving, flat for cleaning up the background of raised carving, it just depends on what shape I need to do what I want done.
Pull scrapers are easy to make. I use 1095 stock from 1/16th to 1/8th inch thick, purchased at Dixon's. As a matter of fact, last year at the fair I did a demo on just how to make them. Boy I had fun!
Maybe Acer will let me do that again. I sure hope so!
Best Regards,
John Cholin