The EU is not a priority for Stripe, which I think is very unfortunate. They only support a subset of countries. I would have switched from Braintree a long time ago if only Stripe were available in Poland.

Braintree works, but is a source of ongoing cost, as it is impossible to do automatic reconciliation. There is no way to connect the (batched) payouts that you get with transactions/invoices. A major problem in the EU.

Also, Braintree has a terrible risk-review approach, where if you trigger a risk review (for example, by growing), they will freeze your accounts for an indefinite amount of time (from weeks to months) and demand various documents from you.