Most secure Open source wallet (physical or not) good for staking ETH

I am looking to get myself more invested into Crypto world. For that, I need some advice and appreciate your attention.

What is the most secure wallet that you can recommend me!?

I understand that physical is a better choice. I don’t mind if it is physical or a wallet app. I can spare an old phone and use it only for my wallet if a software approach is as good as the hardware one.

I am looking for some wallet that is open source. I understand that you can rely on open source much better. Please share your thoughts if that’s not the case.

For now I am only looking at keeping btc and eth so as long as those are covered I am good.

What other aspects shall I keep in mind picking a wallet? Longevity? Anything that you experienced please share. (For example I had a wallet and they have gone out of business, I had to go through hoops to retrieve my coins)

A wallet that give me options to stake eth. I am not looking for the best rate to stake but the most secure one. I understand that there is risk with staking, please share what staking risks you are ok with it and what you are not.

I understand that it might be a wish for all these to come true.