You're probably going to get opinions different than mine, so take it with a grain of salt. I worked for a company that insisted everyone use issued Lenovo computers. Every Lenovo I was issued eventually developed an issue where Rockwell Software, VMWare, Step7, and EPlan would start taking inordinately long times to boot. I can't speak to whether this was a problem specific to those software packages, as aside from the usual Office programs they were almost all I used.
I used a Compaq Armada in the 90's and never had major problems with it, I still use it for SLC100's and other legacy systems. The battery is long dead, but it's still functional. After that I went to Dell, and still use them as my primary engineering computers. There was one minor issue with Dell and Rockwell compatibility years ago, but the fix was so easy I don't even remember the problem.
I've also used Panasonic Toughbooks, generally because I prefer to issue them to maintenance personnel. Very robust and they still are available with a native serial port. The small screen is a major annoyance in the field though.