I believe that dent is partially hidden by the inner roof panel. A stud welder and slide hammer would be your best bet, but you may be able to pry from the inside with a flat bar (while tapping down the high spots), with the end ground smooth so you don’t leave dimples.
I don't know what HB is? HF? Anyway the "best way" is the way YOU can do it. If it has access on the inside, it's a no brainer. If not, I could not pull it out without being able to dolly it back down because you can't pull it to original shape. At least I could not. It would have highs and maybe lows after pulling. You can't get rid of the highs unless you have a lot of experience and tools. I think the idea is to pull it almost back up and then fill. Don't create any protrusion.
I would have to cut the piece out, shape it and weld it back on. Been there, done that. Works for me.
Watch out for careful drivers!!! I'm away on an ego trip. Will be back on Feb 30. I'm not an Auto Mechanic, but I play one on TV. I charge $0.02 for every opinion and I take Paypal. Plan B is always better than plan A, by definition. I used to think beer was bad for me, so I gave up thinking. Sometimes no nonsense makes sense, in a sense. You can't teach a new dog old tricks. Honk if you're Amish