Tuta is great, I like it has its own client, in particular Linux has so few options. Thunderbird is became concerning for me based upon FF underpinning & associated AI moves

That said, I team it with Posteo which is also great, and hard to beat the price

Both bring solid reputation & strong company values & ethics 

Tuta works only with its clients

Posteo doesn't do custom domains 

In any case you can try Tuta for free.  :)