Trade Republic vs Revolut vs MyInvestor: how do you judge an investing app?

I’m in Spain and trying to decide between Trade Republic, Revolut and MyInvestor for investing. I’m less interested in which one is “best” than in what makes an investing app good as a product. For me it’s a toss-up between a clean interface, clear fees, and just trusting the company with your money. Revolut has the all-in-one thing going for it, Trade Republic looks like the simplest, and MyInvestor feels more like a traditional bank. For those who’ve used more than one, what ended up mattering most to you? And do you prefer everything in one app or a separate one just for investing?