In my opinion top 2 faucet scripts is FaucetBox and ePay.
1)
FaucetBox - You will get big traffic very fast but there will be a lot of bots that will steal your faucet balance if you will not add some anti-bot and harder captchas to site.
2)
ePay - In ePay there is not a lot of people claiming like FaucetBox but there is one
+, in this script you will see that bots will not be stealing your balance as in FaucetBox.