Is there a diffrence in perfomance or compatibility or only price :
PC-17000, 4 GB, G.SKILL Aegis series, F4-2133C15S-4GIS, DDR4 2133MHz
vs.
Kingston DDR4 HX Savage,4GB, 2133MHz, Black?
Like @Deadpool said, the one with the lower timings should perform better in theory but that difference is so minimal, you can't notice it. I'd personally go with whatever looks better in your opinion.