It benchmarks about the same
Has a few more hours of battery
The stylus also has less latency
Latency is very much dependent on lots of things:
- digitizer performance (polling rate, pressure sensor assembly responsiveness)
- hardware power (CPU, GPU, Memory bandwidth)
- software efficiency
- canvas size, brush size,
- brush complexity
Unfortunately, these videos are largely useless to compare say SP4 to iPad Pro, since the software will never be 1:1 (even something like Sketchbook Pro is vastly different on the two platforms), and the video authors don't specify things like canvas size, brush size etc.
What we can assume safely from some data we do have is that A9X is very powerful, rivaling Core i5 6200U, and that the polling rate of the digitizer is well past diminishing returns (240Hz). So it's no surprise to see similar lag free experience as fast Windows tablets like SP4.
What irks me is this baseless narrative that the Apple fans and sites are trying to propose that the iPad Pro's digitizer is somehow magically lag free and leagues better than Wacom's or N-Trig's digitizers on Windows tablets. I simply do not see any evidence of that anywhere. It looks like a very good modern pro cap based digitizer with a good pressure sensitive pen. Nothing less, nothing more.