First number is most important. Lower the better and better quality ram.
https://www.masterslair.com/memory-ram-timings-latency-cas-ras-tcl-trcd-trp-tras
If you can help it, go for CL 16.
Is this for a Ryzen build?
Awesome start. I would really consider CL16 ram to go with. Ryzen relies on low timings and frequency for performance. To do with the Infinity Fabric inside the processor.
I would suggest CL14 too but these are a LOT more expensive. CL16 is the sweet spot between cost and performance.
Ehh ok then, what ever she wants
Personally, id rather better functionality over looks but that's just me lol.