@Enstromentals I think it is largely a degree of personal preference and grow-space requirements.
For a dedicated flower space, I recommend either 2700K or 3500K X2s, or the dual-band X3s with 66% 2700K and 33% 5700K.
The X3s deliver a blended 3700K, not much different than the 3500K X2s, but some LED growers believe the deep red and blue spikes from the 2700K and 5700K diodes offer spectral benefits that their CCT "average" belies.
For folks who are moving from HPS, who love HPS, and want to replicate HPS spectrum or at keep their spectrum similar to more easily compare LED performance to HPS, I recommend 2700K.
I personally am more of a sativa hybrid fancier, and I need and appreciate more deep blue in my spectrum, both to hold down stretch and boost THCA/V production. I prefer average CCTs in the 3500-4500K range. The beauty of SolStrips is that you can design the spectrum you want by mixing strips.