UHF vs VHF and 2.4GHz vs 5GHz: Which Frequency Has Better Building Penetration?

I need to settle this in my mind.  I've always been told and learned through school that for two way radio you always for UHF vs. VHF for building penetration..... higher frequency better penetration... recently we've been having the debate about 2.4Ghz vs 5 Ghz Wifi for building penetration and all I can find are articles saying that 2.4Ghz is better for penetration?  to me physics are physics? lower frequency better propagation , higher frequency better penetration no?

Hi Dan-Yep- it's the other way 'round.  Lower frequencies penetrate better.  Higher frequencies are more easily reflected or absorbed by typical building materials. That's one reason we use very low frequencies  (down in the kilohertz range) for communications with submarines. Higher frequencies are best for unobstructed "line-of-sight" transmission, such as satellites.  -Rick

Then why do the RF design guys in two way radio always tout VHF vs. UHF ?
https://www.novacommunications.com/2015/07/15...uhf-radios-which-is-better-for-your-business/