Good to store it there. You should go for viacoin Segwit
How safe is it to store coins in Ledger nano compared to Exchanges? Misplacing or loss of ledger device or device not working after transfering coins to it!
There's a long history of exchanges closing (mtgox, cryptsy, etc) and others acting flaky and making it difficult to withdraw when they run into problems (poloniex, bitfinex come to mind). Do not leave coins on an exchange EVER unless you are comfortable loosing them.
Unless you alone have the private keys, those coins are not yours. Store it in your own wallet always.