I've owned (and sold) both. Scared Stiff is a great game, but it became so boring to me after a few years that I really couldn't stand to play it anymore. Loved to look at and listen to it, though.
WoZ is deep and very entertaining. Good change from SS, in my opinion. I ended up selling it due to the wide body gameplay. Not for me.
Overall, good trade. The only thing I would worry about is that SS is going to be hard to find or buy again if you ever wanted it back. WoZ's could be bought any day of the week.
Good luck.