If you understand Bitcoin, you will like wallet "Unstoppable". (www.unstoppable.money)

It is non-custodial: Only you know private key (seed phrase), only you can control your funds.
It is open-source: Source code is public on github, anyone can check it to make sure there is no leaking of private keys (https://github.com/horizontalsystems/).
It works directly with decentralized Bitcoin network nodes, no dependency on any server, no server to fail or leak your data.

Unstoppable wallet utilizes all potential of Bitcoin, without any sacrifice. Team behind it is motivated to increase Bitcoin adoption by making great wallet to use it.