Picasa vs. iPhoto

Can same one help me for decide what is better for photo sharing and uploading in between picasa and iphoto. Because I am little bit confuse to choose. Anyone tell me the difference of iphone and picasa. I don’t know which is good for me

Login error picasa

Today , I tried to login in to the Picasa through my Gmail address and then tried to login in to my account but , I just could not login , I just don ‘know what causes this problem , I have been trying to fix this problem but , I just don ‘t know what is causing this problem ,Vefore that I have been having no problem with this , please help me out .