I prefer using a Rolling-Release Distribution and when I searched on google I found out that Arch Linux and PCLinuxOS are the commonly used Rolling-Release Distributions.
In recent years LinuX Mint Debian Edition ( LMDE) , antiX and
siduction ( Debian based Rolling ReleaseDistributions ) have gained much popularity as well and I tried them at different stages but did not use them for much longer time periods . Worth mentioning here is semplice ( sid with openbox ) which I still like but have not tested it well enough as yet .
Out of my perosnal experience I find both the Arch Linux and PCLinuxOS as one of the best Rolling-Release Distributions till now : they are stable, reliable,easy to configure and use and work on almost all common hardware.
I use them on daily basis and promote them to my friends , family members and to those who want to try a Linux Distribtution as a replacement for Windows. Of course I urge them to use PCLinuxOS at first and later switch to Arch Linux when they are more experienced and comfortable in handling routine Linux computing issues in command line.