thats quite an overstatement:
Selanne won the scoring title 3 times/Bure won it twice.
Selanne´s five best scoring seasons combined is 274goals/Bure 288.
Selanne had better career
(Selanne is better overall player)
bure won 3 scoring titles-- '94, '00, '01
according to hockey-reference.com, these are both players' goal totals, adjusted for era:
selanne
1992-93 NHL 62 (1)
1996-97 NHL 53 (2)
1997-98 NHL 60 (1)
1998-99 NHL 54 (1)
2005-06 NHL 40 (10)
2006-07 NHL 50 (3)
Active 616 (3)
Career NHL 616 (13)
bure
1992-93 NHL 49 (5)
1993-94 NHL 55 (1)
1997-98 NHL 59 (3)
1999-00 NHL 64 (1)
2000-01 NHL 65 (1)
Career NHL 463 (45)
so, according to one metric, bure's best goal scoring season was statistically superior to selanne's.
if we consider the period of '97-'99 and '99-'01 to be selanne and bure's respective primes (which makes sense considering that both players' only hart nomination occurred during this time), we can see that on the basis of goal scoring, bure was superior. bure finished one adjusted goal behind selanne in '97-'98 (though selanne missed 9 games that season, so his GPG was significantly higher). and bure's back-to-back goal scoring titles blow selanne's back-to-back titles out of the water (65, 64 vs. 60, 54). adjusted stats are not definitive, but it's at the very least an interesting tool for this debate.
obviously, selanne's longevity blows bure's out of the water, but i think bure's peak goal scoring ability is on a whole different level of dominance. also, the playoff goal scoring edge goes to bure, given that selanne has the same amount of playoff goals in 41 extra games. and, while selanne has phenomenal olympic totals (20 goals in 25 games), bure had that one amazing run in nagano when he scored 9 goals in 6 games. personally, i have bure ahead, but i tend to favour peak and playoff performance over longevity.