All these 802.11r/k/v/w need mobile devices to support them to make any benefit from it. Not many client chipsets support all these yet I’m afraid.
11k is cool to have to improve roaming times besides beacons and probes but I had an issue with Unify/Ascom VoWLAN phones. They didn’t only not support it, they were losing PBX communication several times an hour and voice was only unidirectional when that got enabled (I’m not sure if it was 11k at all or just ‘quiet IE’ option on IdentiFi): https://extremeportal.force.com/ExtrArticleDetail?an=000064931
11v is cool to have to ask sticky clients to roam gracefully (not just deassociating them with your fist), I didn’t experience any issues myself but still - STA has to support it
11r is cool to improve roaming times for 802.1X WLAN besides legacy methods like OKC or Preauth, but all these methods’ support vary by vendors. I had an issue myself with that one (again IdentiFi) with Intel 11ac adapters that are supposed to support 11r. With that turned on, 4-way handshake was breaking in the middle. https://extremeportal.force.com/ExtrArticleDetail?an=000076245 I didn’t see that working properly last year.
To sum up, I’d say - try each (one by one) and see what happens. :)
Hope that helps,