if it’s free, you’re the product.
signal seems really good right now, with open source clients, but they already show that they’d like to keep the ecosystem locked down by not allowing 3rd party clients. at some point they will need a way to pay for their datacenters, and even if they claim the foundation or whatever is doing well, i can see the pestering for donations getting much worse in the future.
that said, threema is far from optimal too, im still waiting for matrix servers to become solid options. last time i wanted to set up synapse, the only captcha they supported was fucking Google captcha :|
I know stuff is missing from it and it doesn’t have reviews, but when i’m on my own i just check organic maps first, if i find something that looks decent i just try it.
when traveling with others i often have to turn to tripadvisor or google maps to make sure to find something they like, not everyone is as happy to just try as me.