I like both classes, but I'm playing a wizard in AoW, and I think wizard is the way to go. Two points in particular:
1) As was previously mentioned, knowledge checks are big in AoW, but wizards are also just good in general with skills, even cross-class and especially those useful trained-only ones. Consider taking a rank in appraise, unless your DM is generous with revealing value of treasure. Also consider some ranks in Disable Device and so you can automatically Aid Another for the rogue. With a high intelligence, it's easy to get these skills up to an "auto-succeed" level.
2) I also would not underestimate the value of getting higher level spells a level earlier than a sorcerer. In a deadly campaign like AoW, just having access to third level spells at 5th rather than 6th level is a big boost to your potential power. A sorcerer in the Whispering Cairn will probably feel like it takes an agonizingly long and treacherous time to get to second level spells.
Humbaba