Resource - Budget Tracker
In my opinion, this is a little strategy and a little personal preference. A variable rate loan (like a mortgage) means your interest rate changes each year... it goes with the market, so you will see ups and downs. Fixed rate means you have the same interest rate every year... whether the market is up or down. Personally, I prefer fixed because I'm a planner and I like knowing what I'm getting into. Your variable rate may be lower right now, but if the market has a bad year, it will increase. (And that's not gonna be a great year to have a higher mortgage payment!)
Without knowing your specific situation, I can't really say one way or the other, but I really like this article by Bankrate. It walks you through the pros and cons of each, and then asks specific questions that help you figure out which one is best for you.