The plus point of Yahoo! Is because he is older, so that more people know my Yahoo! then my gmail, and from appearance point of view Yahoo! is still more beautiful for me. But when it comes to attaching file especially which require a big MB then Gmail is much more convenient. Gmail proud in one of his feature, that they do not put a lot of advertisement on their pages, but for me it is not a big deal, instead for me it is fun to see various ads picture while you are waiting the open page process.
This wold pro to fast things, and those which give more freedom for the user, that’s why I think Gmail will win over yahoo! Yahoo! can bring back the glory if they can be responsive to the global atmosphere.