The XPS 17 isn't out yet so I can't offer a personal comparison. Dell increased the size of the trackpad in the 2020 XPS 15/17, but otherwise it seems similar to previous ones.

YouTube reviews of engineering samples of the 2020 XPS line say they are best-in-class for Windows, which usually means they're not quite as good as Macs (same as laptop speakers, where the MBP also leads).

I find even Mac trackpads slow/frustrating after using a Logitech MX Ergo for a while, so trackpad experience is less of a factor for me.

I use an older xps-15, mostly running linux, and the trackpad is excellent.

I switch between it and a mac for work, and the experience is 95% identical.

Probably not very good. Personally I always use a Magic Trackpad 2 so I no longer have to take this into consideration.