[Haskell-cafe] let vs. where

Hello, I know there are several important differences between let-expressions and where-clauses regarding scoping and the restriction of "where" to a top-level definition. However, frequently I write code in which either one would be allowed, and I was wondering if there were any guidelines or preferences for one structure over the other. Currently my choice is guided by aesthetics more than anything else ( I prefer the look and ordering of a where clause). Is there anything else I should consider? What do veteran Haskell programmers prefer? Thank you, John Lato