You should consider adding Schildlbach (most recent version 10.26, see Wallet Scrutiny). It's been around for a good while and is pretty commonly used. Not too many other spv wallets out there.
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)
You should consider adding Schildlbach (most recent version 10.26, see Wallet Scrutiny). It's been around for a good while and is pretty commonly used. Not too many other spv wallets out there.