I think it may be exactly the same as core's wallet.
Not exactly, but mostly the same - Luke sometimes merges PRs ahead of Core (IIRC this is what caused the transifex fight a while back - Knots' user-facing text is slightly different from Core because of this)
Also Bitcoin Core's wallet is not bad at all.
Knots has a wallet, too, but I've never used it (I think it may be exactly the same as core's wallet).