I’ve never used Welltory. Looks like you’d end up with paralysis by analysis with all that data though 
HRV4T displays a recovery score, rMSSD and resting HR.
From everything I’ve read and listened to, HRV4T and Elite HRV seem to be the HRV apps recommended by most people. I’d personally recommend HRV4T. The developer (Marco Altini) is great as well if you have any questions about the app.