I see it as a matter of personal style: Quicken is stupid simple to use and has a lot of great customizable reports that I use every year during tax season. Excel gives you the maximum power and flexibility to do whatever you want with your data (Feels odd using those words to describe a Microsoft product, but hey it's pretty damn good.)

Seems to me you'd probably be able to learn Quicken in about 20 minutes, and it's cheap (US$29).

Though, I imagine trying to import your existing data into Quicken might be a major project if you have a lot of custom fields. I've never tried it so can't comment.