Tough choice, on a certain level. I would say that the two are probably the best two pure goal scorers of the last decade or so.
Hull has the gaudier personal numbers, and probably has had the better career overall. He's a lock for the hall of fame, IMO. His one-timer is one of (if not the) best ever, and an 86 goal season is insane, and speaks for itself. Hull at his peak was an absolute terror.
Then there's Bure. Unquestionably one of the most exciting players of the last generation, if not ever. One of the fastest and most explosive players ever. His wrist and snap shots are wicked, and IMO his slap and one timer are underrated; he scored a lot of goals just flying up the wing and letting one rip. Also, his international career is very very good, a fact many overlook. On the other hand there are a lot of knocks against him; he is soft on D, can be maddeningly inconsistent, has reputation for being selfish, and other than here in Vancouver in the early 90's, never really played for a contender/good team. As much as I would like him to, I don't think he's going to make the hall of fame - he's never won a cup, never hit 500 goals (although he would have been a lock if he was healthy, to be sure).
But I'd still take Bure. Why? First of all, as said look at who he has played with over his career. While Hull has played with Oates, Modano, Datsyuk, etc, who has Bure played with? Anatoli Semenov, Murray Craven, Viktor Kozlov (and in his rookie season Igor Larionov, the only true playmaker he's been paired with). Bure has never been surrounded with the same kind of talent Hull has (except in New York, but that was an absolute debacle, and after he had been ***** by injuries). I suppose this proves that he can't carry a team on his own, but it also makes you wonder what heights he would have reached playing his prime on better teams. Purely looking at their skill sets, Bure takes it in a landslide. True, Hull has perhaps the most deadly release ever. But Pavel more makes up for it with his skating and puckhandling ability, not to mention his shot, which is still better than 90% of the league.
So, for me, Bure. Hull was amazing but IMO he still can't touch Bure.
lol, sorry for the essay-length response