Presenting web services from DMZ to Internet ? To Reverse Proxy or not?

Hi Guys,

When would a reverse proxy be favored over a traditional load balancer for making websites/applications accessible from the internet?

After reading about reverse proxy, to me it seems like the more "secure" option for publishing websites out to the internet - however in the jobs I have worked before we have not used this technology to make web servers accessible from the internet - we always perform a NAT into the DMZ, to the front end of a load balancer and the web servers sit behind that.

When would a reverse proxy be favored over a load balancer and visa versa?