simple . ask yourself what do YOU want ? money , upload speed ,good free download speed ,good premium download speed,both , stable host ...
if you care about upload speed , without thinking choose rapidshare . if you are looking for something else , experiment and choose by your own . give you self a couple of weeks , post different links/hosts and see with which host do you have best reaction from downloaders .
mediafire and ul.to also have good ul speed !