Can anyone with experience with Fable - - compare their experience with ReasonML since they both have the same OcaML pedigree - offer any perspectives on effi

Can anyone with experience with Fable - - compare their experience with ReasonML since they both have the same OcaML pedigree - offer any perspectives on efficiencies of various constructs? For example, do things like seq add additional complexity or are about as efficient as for loops? - discuss the output size .. by virtue of using .net libraries versus javascript builtins?