Curious to hear why you think Adyen is shit?
Random API outages (without any reporting), bad SDK's available, no developer support. It makes it a nightmare to integrate and maintain. Besides that, the sales representatives are complete bullshit. Communication takes ~2 days to respond to a simple inquiry, for an essential part of someone's business that is just way too long.
On the other hand, Pay.nl has always responded to us within 15 minutes or so. They report outages directly to us (although they have not had one in a very long time), and keep us unformed when e.g. the api changes.