PowerBrocker or Sudo Which one is better?

I was given a task to implement security policies with in a set of server environment.

The first thing that comes into my mind ,"Shall i go for 3rd party utility or use existing system utilities to achieve this?"

With little bit googling i come across a fine utility called powerbroker.

http://www.beyondtrust.com/Products/PowerBroker-Servers-Unix/

It had everything i was looking after but then "It was not free or open sourced"

I needed to know How effective is Power-brocker utility over SUDO? After posting my query on linux forums i got to know lot of pro/cons about using PB over SUDO.

Here is the link which helped me decide on Which one is better?

http://webcache.googleusercontent.com/search?q=cache:ANT8RddJJdIJ:forums11.itrc.hp.com/service/forums/questionanswer.do%3FthreadId%3D956140+Power+broker+sudo&cd=2&hl=en&ct=clnk&source=www.google.com

Currently looking for an open sourced utility to achieve this.