90% of the features overlap. Depending on your particular needs, one or the other may be preferred, e.g. multiple currencies. I use hledger for the Haskell street cred. ;)

edit: http://hledger.org/faq.html

Thanks. Looks like ledger does multiple currencies but hledger did not mention that in its features list. Will probably start with ledger then.

I was wrong about that particular feature, hledger calls it "multiple commodities" instead.