The easiest and most feature rich system is Mandriva. This is because they don't worry about mp3 and other software patents (a French thing) so you can play divx movies and listen to mp3's (Other Distros need extra software for this) and their installer is rather simple, the administration package drakeX is also simple. I prefer OpenSUSE.
But in the end all Linuxes are alike and in the it's a subjective choice. But the first experience is important to motivate the user to migrate to Linux.
Agreed, which distribution is best is a choice best made out of experience. I am no newbie to GNU/Linux, I started with Mandrake (now Mandriva, and it was awful.) Then I tried Red Hat, and found it very unfriendly. Interestingly, Fedora Core rc4 was very easy to use, despite being a Red Hat product. Then Slackware (getting experience points here
), then Gentoo for 4 years. During my time with Gentoo, I played with the early incarnations of Ubuntu. I liked it a lot, but I was a control freak, and kept going back to Gentoo. Now I'm using Ubuntu permanently as I just want a easy life.
But I disagree. Ubuntu _used_ to not support mp3 and other proprietary media. It now supports it all by default. So playing region coded DVDs, DivX files, mp3's etc requires no effort at all. And, based on my experience with Mandrake (back in the day), I could never ever suggest Mandriva. Although, times change so it could now not be a pain in the backside. I don't know, and I don't want to find out
For a newbie migrating from Windows, I might be tempted to suggest SuSE. But I personally never liked SuSE. I would always recommend Ubuntu though. 8.10 is very VERY easy to install. The only thing that might trip you up would be the HDD partitioning tool. But then, I've never used guided, I have always done manual. The only slight problem ou might have with Ubuntu is the updates notifier. After install, it alerts you that updates are available. No fewer than 272 packages. That's a bit of a headache, but once it's out of the way it's fine. Only thing going for SuSE over Ubuntu is possibly YaST. It's central control configuration tool. Ubuntu configuration is a bit more modular (the polite way of putting it
) but again, it's no big deal.
So, long story short:
SuSE (maybe)
Ubuntu (definitely)
PC BSD (not Linux, is a different Unix variant)
This is, of course, all IMHO
Good luck.