My first longrifle was Dixie percussion kit with drum and nipple. I shot it for a couple of years then converted it to a flintlock. I never looked back.
That said, I started my wife, daughter and now my grandkids off with percussion guns because learning muzzle loading is complicated enough without that messing with the flint. All this was years ago.
Now my daughter, son-in-law, oldest grandson and I shoot flint, my wife, middle grandson and granddaughter shoot percussion. They simply do not like to fiddle with the flintlock, they want to shoot.
Smoothbore shooters like the challenge of a smoothy so it is not surprising that many also enjoy flintlocks.
I think the advice about buying a gun you can convert is spot on. But what is more important is to buy a gun that does what you to do. A gun that you really cannot wait to get out and shoot again and again. That is more important than if it is a flinter or cap lock. :wink: