Out
The wallet is good to use because it is an
open source,
non custodian, also have a good privacy and secure features. Your mobile version can access it and it can also be accessible through desktops. The Nunchuk wallet is a good wallet because it has enough addresses.
I actually don't see any reason to change my old popular wallet for any new one, the old ones already have some reputation, if they are bad no one will use them, but it's not the same with new bitcoin wallets, especially this one with cloud backup, don't try it.
Perhaps, if your old wallet is functioning properly I think there is no need to create new one. What's important to any wallets is their security features, when the security is not good you have to change it, but if the security system is working perfectly you have to keep using it
Depends on the old wallet.
For instance, starting from v.21.0 Bitcoin Core wallets are descriptor-type ones and though they support (nowadays) the old (non- descriptor-type) wallet.dat format, the relevant old stuff is gradually shifted to the full oblivion. (
the timeline is here). They promise to implement some migration tool, but, to be on the safe side I would prefer to create manually new descriptor wallet and move my stash from the old addresses to new ones.