Can’t help you decide, but I’m running a 15 inch MacBook Pro bought about 4 years ago. Still running Leopard on it. Runs like a champ, I reboot every month or two whether I need to or not.
Unlike a Dell / Win 7 at work which has to be restarted at least once a day, the same as every other Windows machine I’ve ever had. By the time they are 18 months old, the OS just craps out and the apps crashes all the time. No amount of AV, anti-adware, registry cleaning, drive optimization, etc, etc fixes the problems.
Lenovos are good
I have been using a Dell XPS 1530 for 7 years. No problems here.