This is not my experience with XPS 15 (2019). It is substantially slower, it is loud and battery used to last less than an hour. Then constantly dying chargers, I had a box of Dell chargers that worked for a month and then laptop stopped recognising them.
For the tasks I do (I use Docker heavily) M1 is more than twice as fast in low power mode and never heard fans going off or felt any slowdowns.
On XPS if I opened a heavier webpage, it was possible for the entire laptop to slow down and not even refreshing the screen timely, so you witnessed a slideshow and usually only way out was to perform a hard reset.
Also random power off or if it goes to sleep it won't wake up. I have to then leave it for an hour and then maybe it will power on (sometimes I have to try a couple of times). This is actually the same experience I had with earlier XPS 13.
Google XPS won't power on - plenty of people have this problem.
