Yeah, there's a pretty big taste difference between speculoos and speculaas, haha. I'm firmly in the speculaas camp. Speculoos is okay, but I see it as the inferior version for my tastebuds.
There's also gevulde speculaas! Though that might be very difficult to find outside of BENELUX (and maybe Germany?). It's a layer of soft speculaas, a layer of almond spice, and a layer of soft speculaas. Not a cookie, more like a slice. If you have the spice mix it's a pretty easy recipe to make, though!
In Tas there was always a Dutch section of the grocery store, I presume because there was and is a fairly large Dutch immigrant community (mostly second and third gen now, though, first gen is aging out). They always had speculaas, though never the gevulde speculaas.