I was facing a similar dilemma not more than a month ago. Did i really want to upgrade to three 144hz monitors? Even if you don't play games, the native 144 hz is very smooth for everyday use. It makes for a very pleasurable windows experience. If you have the money, then a 144hz will provide you with a good experience either way.
A 144hz monitor technically will be more "stress" on the pc because the GPU has to work more than twice as hard as with a typical 60hz monitor of the same resolution.
What do you want more? more monitors or a higher native refresh rate?
If you want both, you will need to drop more $$$ on GPU's to get a gaming experience to take advantage of the 144hz.