Is it batter to use only one adsense account for all sites? or more than one adsense accounts for sites?
Just one. You may want to read over the Adsense TOS again. You can use the same account for all of your sites.
I think one account is enough unless you are planning to do some scammy task. However you can apply for two AdSense account as i Know.One is solely and other is business account.
lol google offer only one account for 1 person. not multiple accounts. what ever you have one or more sites you should only use 1 acc for it. do not think to use multiple accounts. you will get banned from adsense soon.
One Adsense account is enough for one. According to Adsense TOS one man can have only one account. If you make more then your account will be banned. You can show ads to your all sites from your one Adsense account and it is legal.
One account for all sited because having more than one account is not allowed, you will get banned if Adsense found it
Of course you should stick to JUST one personal account. Of course if you really own a business you can also apply for a business account. But that's that.
multiple accounts are not allowed..... even if u make multiple accounts in different names then u will have to wait for each account to reach the minimum payment (i.e $100)
just use a single account for multiple website take a look of the below link, google actually dont want to decrease the number of account, but allow multiple website to add in a single account http://www.google.com/support/forum/p/AdSense/thread?tid=562560a925f0361f&hl=en