Mageia works very well for me.

[allinaallen]

Please leave a message on saying which one you prefer and a few reasons.
For me I am kinda leaning towards Mageia but have a public opinion!
All Linux Kernel so all are very hardware friendly!
For me:
Ubuntu -- User Interface is very nice while allowing both Programmers(Debian) and easy interface. So its a first step down from Debian so it works better in the public eye, currently the one I use.
Mint -- The best UI from all of them. I think speed is very well, in my box I only gave it about 1 GB of RAM, worked just like the speed of Ubuntu (2GB).
Mageia -- I like the direction. More user friendly great package development. And I like the way they are going.

Down Sides:
Ubuntu -- Packages need improvement. Not as user-friendly as the others, you could screw up hda1 or your partition if you don't read the warnings.
Mint -- Very hostile programming environment!
Mageia -- I don't know where they are heading yet, but bright future! Needs some Canonical or something for funding organization! They are -8k in 2012(With funds and projected costs).
So please state your favorite!
Additional Details
Well I like Unity in my personal preference. Its more natural to me.
The reason I use Ubuntu is because it is able to do all I want:
Program, and
its user-friendly.
But I might have to let Mint 11, and GNOME back into my heart as Gnome is still a very stable setup. I personally have yet to have an issue with Unity.
Also Mageia works very well for me.
So I might Dual-Boot them.

I also will add a vote.

[filip]

Mageia -- I don't know where they are heading yet, but bright future! Needs some Canonical or something for funding organization!

One of the strong reason that I like Mageia is that it's a fully independent community distro.

Every distro has some upsides and downsides. Mageia is user friendly and I can live and work with it. It's also fun and nice for contribution. So I just don't search any more for any other. I used Parted Magic for HD tests and manipulation but since I'm suddenly and without any warning or even explanation forced to donate for each release I stopped using it. That is another important reason for for me using Mageia. It's open also in communication.

[jiml8]

Since they started putting spyware and adware into Ubuntu, I won't use it at all. I don't like that unity interface anyway; it is horrible for a desktop system.