GREG RAVEN While MAMP Pro on the surface seems easier to use, it hasn't been updated in almost a year, and support for it seems to have ceased for all intents and purposes. From what I can tell, to set up virtual hosts in XAMPP you have to edit httpd.conf to allow virtual hosts, and then edit the virtual hosts file in the extra folder. This is more difficult that simply adding a line to your hosts file, which MAMP Pro recognizes, but it is also the new standard for managing virtual hosts. It's also nice that XAMPP has the more recent versions of Apache, MySQL, PHP, etc. Last but not least, XAMPP is free, where you have to pay for MAMP Pro.
(Version 1.0.1)