Either will get the job done, honestly. I prefer Hotmail when it comes to the user interface. My number one option would be Gmail, as I'm sure a few others have pointed out as well.
Hotmail blocks all kind of crap that yahoo usually don't. Some say it's good others say it blocks too much. Gmail is decent but too much privacy issues. They like to scan your email and show ads based on the content of your email. Good for them, bad for you. If gmail and google in particular wouldn't do this I would vote for them. At the present time I do not know who has more privacy issues facebook or google. Reminds me of at&t routing calls through the nsa a few years back. Be careful with google voice too. Who knows what they are doing with that info. It is a close one. It wouldn't surprise me if both google and facebook have some ties to the government.
I have one yahoo account mainly because I use it for answers and diggo.. Although I like using gmail compared to the two.. but if I have to choose between the two, yahoomail for me
yap its yahoo its more then better then MSN its true that yahoo show a lots of ads on their mail system but yaho is better thn msn
yahoo its better from me because it has an strong security system and its always secure and their user interface its too good