We often recommend both software packages in our practice in different circumstances. One is cheap (free in fact) and will get you by, while the other is a full service accounting package which will easily accomodate growing businesses. The question we often ask is, do you want to grow your business? It is a rhetorical question really.
If you are trying to decide which software to use in your business, then read this article from someone who has used both to aid in your decision.