Gmail is neater but Yahoo is not bad.. but overall, nothing is better than any of these two.
The only reason i am still with Yahoo is that Gmail fails to load sometimes, and i can't wait for it to come back. I have my mails set to arrive at both my gmail and yahoo accounts.
I use both Ymail as well as Gmail.
For me its Gmail, the reason for the reason having good junk control and can be use as pop account also.
my favorite is Yahoo..
I am using it since i was online for the first time..
gmail is the best