The scalability issues still do exist for both Eth and LTC, so I wouldn't prefer either one at this time. I think Stellar, Bitshares and NEM are much more suitable for businesses as a payment solution.
I don't have those 3 coins that you mentioned but for the closest one would be LTC.
LTC because they will launch Lightning Network very soon. This mean lowest possible taxes for business and fastest transactions.
ETH is flooded from time to time from ICOs and games like CryptoKitties. At those moments, taxes are $4-$6 per transaction.
Yeah that's why I didn't consider ETH as payment solution though its still good but for someone that wants to be sure that he's running his business well when it comes to crypto payments, LTC will play the role better.