I've only ever tried the Ring one and it's not bad. Would say get the Ring 2 as it's higher Def. Really handy for intercepting parcels but image quality isn't great on out 720p one.
Battery but can be hard wired. Battery lasts 4-6 weeks I think then 5 hour charge.Is yours battery or hardwired ?
Do you get a lag when doorbell is triggered to when you get notifications?
I've not got one but people say they are ok if you have a good wifi signal otherwise it can be a bit flakey.