I think it comes down to your hardware and personal preference. Ubuntu is great for users who have decent hardware and like a little eye candy. Lubuntu is for older hardware and hits the ground running. I find Mint to be just right for my older AMD Sempron 64 with 512MB RAM. I am still new to Linux as well, and seen a video on Compiz effects, and this is why I chose to make the switch. On Ubuntu, compiz was laggy and seemed buggy. Although Mint took some configuring, Compiz runs well with my older hardware. Please note that my build has a 128MB AGP installed as well. Burn some live CDs and find which is more of your style, and note that the Distro you choose will run smoother once you do the full installation. Look at your hardware, view videos of the distro, and test drive... I found it very simple to choose a distro this way.