Usability of payment pages VS reputation of the payment aggregator?

Question

Payment systems

I choose a payment aggregator and thought about how much more people trust Yandex.checkout just because the Yandex icon is there.
but their form of payment is lame.
So I’m thinking, in what place will a larger percentage of people drop out, in a nice interface, but with an unknown resource, or in a wretched interface but with a Yandex icon?