I use every kind of e-mail services aviable =D, that's because I play Ninja Saga on Facebook, and I need dummy accounts to get friend invites then rewards, I have about 100 mail : I started with Yahoo since it's the e-mail service we use at school, then I used Hotmail for MSN, then G-Mail then AOl & ...
I heard Gmail is cool, but I'm stuck with Hotmail. Because if I change right now, then I need to go to every website to change my email, on the control panel/option.
I personally use hotmail because I love the reliabilty well every single thing about it. Also gmail is best at holding files and emails you might need. Gmail has the most storage available for each user and its counting.
I use Hotmail. It used to suck, but to compete with G-Mail they have become incredible. I had used g-mail for a while but I got so much spam in both my inbox and my junk folder (and I hadn't signed up for anything). It really ticked me off, I only expect spam if I sign up for something and then it had better go in my junk folder. That and I have had Hotmail as my service provider on and off for 12 years.