Neither, he will clearly go in as a San Francisco Giant, where he spent the best year of his career.
Actually, I suspect he will be either a blank hat or a Diamondback. It's a more important decision than most because neither the Mariners nor the Diamondbacks have a player in the Hall of Fame.
Looking at that list of 90+ percent inductees, it's clear that this process has never made sense. Babe Ruth and
Willie Mays both got about 95 percent of the vote. What was the issue with the other five percent of voters? Is there any sound or reasonable argument against these guys? I guess with Ruth, you can argue that he was competing against the whole of baseball history up to that point, so maybe the vote was diluted a bit.
One dude this year, Jerry Green, voted for Clemens and McGwire... but not Bonds. He wrote a column about his votes, but didn't mention Bonds or how he came to determine Mark McGwire earned a vote and Bonds did not when by every conceivable metric Bonds was miles better. It's a great article, though, and demonstrates that he takes the voting seriously and laments his colleagues that do not:
http://www.detroitnews.com/story/opinion/columnists/jerry-green/2015/01/03/green-hall-fame-voting-serious-business/21242617/
It upsets me to no end the grandstanding over PEDs now, when the players involved are for the most part retired. The players the same writers voted in as Cy Youngs and MVPs even after they suspected or even knew the players used PEDs. The PEDs that the same writers for years never cared to investigate when it was becoming fairly clear that they were infiltrating the sport. But *now* they grandstand and lament about the integrity of the game. It's all a load of nonsense. They excuse some forms of cheating (amphetamines, doctoring the ball) while excluding this one specific form. Yet they don't *really* know who was clean and who was not. Surely there are steroid users enshrined already, and will be again in the future. Some combat this by never voting for anyone in the era, which is the antithesis of fairness.
There are suspected murderers and hideously racist members of the Hall. There are even gamblers who bet on the game. It's highly probable Ty Cobb was all three... and he's there. But let us not sully the reputation of this hallowed institution with players who worked ridiculously hard to achieve greatness, including using substances they shouldn't have used but virtually everyone in the game ignored for years because nobody wanted to stop the gravy train.