HAProxy Community Edition is a free, open source reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications. It is presented as suited for very high traffic web sites.
We chose HA Proxy because it is cheaper than a hardware balancer, it is an open-source solution with a large community behind it and with constant updates. It also allows custom scripts according to needs.HA Proxy is a solution used in many internet sites like GitHub, Reddit, …
The cost is significantly lower and personally I don't find one to be harder to learn than the other. Overall they features stack up pretty closely and I'd pick HAProxy wherever it was feasible and we can save a tremendous amount of money for the business. The NetScalers & …
HAProxy has been more reliable than any other load balancing product we have used or tried. It just works, pretty much flawlessly. Other competing products were unreliable and required a lot of maintenance.