I recently installed Ubuntu on my laptop and so far everything is fine, it works great. However, as a newbie, I made the silly mistake of not documenting myself too much about all the possible alternatives to Windows, such as Lubuntu, Linux mint, Fedora etc.. I would like to test some of these on my machine, however I prefer not to wipe out all the disk, and therefore I would like to test the system either on a virtual box (Boxes on Ubuntu should work fine) or on an external hard drive. (I own a 2.0 USB external hard drive)
I would like to test, say Fedora, and have it handy for a couple of weeks. My aim is to test the OS in an environment which makes it the closest possible to the actual installation on the internal hard disk (ie. experience the less slowdowns possible). Which one of the two options should I go for?