while in Ledger nano S, even If they choose to not support the forked coin, you still have access to your private keys (indirectly using the seed) and you could import it somewhere else to claim the new coin.
For this reason alone it is better to leave your coins on the trusted Ledger, rather than move them to an untrusted hard forking coin developer owned wallet...that no one has ever heard of.
A mediocre alternative is moving your coins to YoBit or another major exchange that has already announced support for the hard fork you're chasing (I realize their may be several).
Ad this Omega gent states above, while Ledger may choose not to support a hard fork, you still have the control of your coins and can move them to claim the forking coins...all of them.