I'm not sure I want to wade-into this 'Housley vs. Gartner' quagmire, but as my position is somewhere in the middle, I think I'll share it:
For Hall of Fame consideration, Garter should be IN and Housley should be OUT. There isn't an overwhelming difference in their respective cases and they're both near the borderline for various reasons, but I do perceive a clear difference between them in favor of Gartner.
Why do I say this? What is this difference based on?
It's based on these 2 factors:
1) Being considered elite / dependable / desirable by peers/coaches/GMs
2) Appropriate style for their positions
I'll explain further:
1) Garter was only occasionally considered top-5 at his position in a given season (three times by All-Star nods), and Housley likewise (four times, but D-men have a little less competition). So they're about even in how they ranked against their peers by All-Star consideration. Likewise, Gartner is 4th-all time in RW goals and Housley is 4th all-time in D-man scoring. But Housley was not a player that coaches/GMs (maybe even his own peers) would have asked to join elite line-ups. (Yeah, I realize Housley played for the US Canada Cup teams, but would he even have been invited to Team Canada's? I don't think so.) I mean, in the 1996 World Cup, he was basically benched, and this was when he was still a 68-point-a-year defenceman. Gartner, however, played for team Canada at the Canada Cup in 1984 and 1987 -- the latter team being arguably the most talented Team Canada ever assembled. There is no chance that a Phil Housley would have made this team.
(I'm aware that this argument can be used against Gartner -- that Housley was still playing for national championships in 1996 and Gartner wasn't. But I honestly don't think Housley would have made any Team Canada line-up from 1981 through 1996, nor that any fans would have missed him. Besides which, the record shows that Gartner's prime production years actually lasted about two years longer than Housley's; i.e., Gartner would still have been a legit choice for a national-team line-up as late as age 37.)
To put this another way: Gartner was good enough to play on two teams with prime Gretzky, Messier, Bossy, Lemieux, Bourque (and he won at both). Would Housley have been good enough to play on those teams? I say 'no'.
2) Housley was the prototypical 80s' offensive defenceman... but he was still a defenceman. At defence, he sucked. (Housley has by far the worst plus/minus of the top-22 scoring defencemen in history.) Gartner was a forward. At playing forward, he was great.
So, while neither guy is prime Hall of Fame material, I think Gartner outpaces Housley in the race for the final dregs of Hall of Fame membership.