My opinion is that I want a brass pick, smaller diameter than the touch hole. Protects the flash hole.
I was taught that a pick will clear fouling (logically), but it also makes a channel into the compressed powder charge. This allows the flame into the center of the charge for more consistent, faster ignition. I was taught by a target shooter who has shot at Friendship for years....and brings home medals.
I run a pick into the charge right after I wipe the pan & frizzen (given time) and before I prime the pan.
For hunting? I'd still pick for that first load of the day, but not bother for any follow-up shots.
I hope this helps. God Bless, Marc