Compare HTTP load balacing using HAProxy & Nginx

My requirements:

1. Weighted RR load balancing
2. NO need sticky session support
3. NO need SSL
4. NO need HTTP 1.1 to backend

So effectively I just need very simple HTTP load balacing!!

My Boss asked to try HA Proxy, but I am wondering if HA Proxy is over-kill for me, I am wondering what are the benefit of using HA Proxy, when compared to the existing nginx' HttpUpstreamModule

e.g. (existing nginx config)

upstream backend  {
  server backend1.example.com weight=5;
  server backend2.example.com:8080;
  server unix:/tmp/backend3;
} 

Since I don't use HAProxy in the past so I want to listen to your opinion.