Forget about Fontbook unless you're only managing a handful of fonts. I've used both Font Reserve and Suitcase a lot for as long as both have been around. They both have features I love and neither one is a clear cut winner for me. I'm currently using Suitcase and I often long for some of Font Reserve's features. Extensis bought Font Reserve a year or two ago, and when I spoke with an Extensis rep, he said their plans were to combine some of the best features of both into one mondo program. Time will tell.