Hi ALL . If i transfer my funds from two nano s to a new nano x , do i have to use the back up keys from nano s's or can i create new seed phrase/ 24 word recovery for new nano x [ which i would prefer to do . ? Any advice much appreciated . thanks for your time .
If you prefer to use the same Seed, you can just enter your old seed in your new Ledger Nano X. There is no need to create a new seed phrase.
If you recover from your old seed you won't need to make any transaction, so you won't spend fees.
BUt it doesn't make much difference to create a new one or to recover.
Just don't throw the old one away, it's never a good idear to completely delete wallets.
As mocacinno pointed out, there is no need to throw away your old seed if you decide to create a new one. It is good to keep it up to recover possible future forks, for example. Or to sign a transaction if you need.
Just be careful to properly back up your new seed as well before sending your money. Ledger Nano S sometimes resets when updating, so it is very important to have the seed so you can recover your funds