I tried a few versions of Surface, but I found the Apple stylus to have about half the latency (or maybe less), with better precision/accuracy, and the signal processing done by the software I tried to convert pen inputs to strokes/lines seemed more polished/effective.

I’m sure there are some customers / use cases where those differences aren’t a deal-breaker. Personally I really appreciate it. I have been very impressed with the iPad pen input. It’s clear their hardware and software engineers collaborated closely to make a really impressive device and experience. (Again, as long as you mainly are using pen input.)

It’s possible there’s other software out there that does a better job than Microsoft’s first party stuff or the couple of third-party apps I tried.