X4 Pro - Stock or CrossPoint for a newcomer?

Hi, for background, my friend and I recently bought our first ever ereader, which is the X4 Pro, and we're waiting for it to ship now. While waiting for it to arrive, can someone please tell me the difference between stock firmware and CrossPoint? I feel like some posts are either ads for one or the other, so I just want some personal opinions on what to get. A few months ago, people said the stock wasn't good, but now there are so many people who are recently reporting that the stock is good.

I also want to hear what the difference is between the two. What features and other stuff make one more worth it than the other?

Also, is it true that CrossPoint is laggy in an X4 Pro?

Sorry for any grammatical errors, English is not my native language!