I think one significant difference is in the actual implementation, or rather its intended use. The BEAM implementation is built to be used in products, it is v

I think one significant difference is in the actual implementation, or rather its intended use. The BEAM implementation is built to be used in products, it is very stable and bug-free and the OTP team are very cautious when making changes. Incompatible changes are introduced with early notices and warnings, usually 3 major releases before the change is made. My impression is that Haskell implementations are more used as research tools and there is less control of what goes in and how it is to be supported. In that sense it would be safer to build a product on top of Erlang. That is just my impression and I could be wrong.