At this point, the X5 is the newcomer, so it's sort of the current distraction rather than the other way around
I still own my 2002 6-speed maxima (hence the username) and this was my first car I got when I was 16. Still looks and drives like new and puts a smile on my face with 250k miles. I have no hesitation driving this on long distances and have no intention of getting rid of it. It doesn't currently *need* anything, but I did purchase an all new cooling system as preventative maintenance since it's all original aside from the two radiator hoses.
My tow/off road vehicle is a 2018 Titan Pro-4x. Very comfy on long drives but obviously not great fuel economy, although the X5 doesn't do much better.
And I do have a modern BMW to maintain as well - a G01 X3. It's my mom's and I do all the maintenance/work to it. She drives about 25k miles a year and I plan to be overly enthusiastic about maintenance like I am on my vehicles. It's crazy how the new X3 is larger than the E53!