okay so I will just say what worked for us because context matters
we had a specific situation: my son was 12, getting into Discord way too deep, some of the servers he was joining were not appropriate at all and we only found out because he mentioned something at dinner that he definitely did not learn from us
we tried a few things and Bark is the one that actually caught something actionable. Got an alert about a conversation that had some really concerning language coming from another user in a group chat. We were able to talk to him about it, remove him from that server, and have a longer conversation about what communities online are actually safe.
Aura we used more for the everyday management side. His bedtime screen cutoff is 9pm and it holds. No negotiation because the app enforces it, which honestly took that fight off the table entirely which was a relief for both of us.
using both is more expensive but for us the cost is worth it because they cover different things. Bark is our early warning system and Aura is our daily structure tool. neither replaces parenting but both make it easier to keep up with a kid who is way more tech-comfortable than we are