If your rationale is “cash” then the longetivity of the ledger is irrelevant.  I get in and I get out of Litecoin at my destination.

No one cares that the Bcash ledger goes back to 2009 and the Litecoin ledger only goes back to 2011.

If you do care, you are being financially irrational.   The only choice is what vehicle gets me there fastest and cheapest.   

If I am using BTC as a trading pair it is often cheaper and fast enough just to stay in BTC.