WH3000RP variants

I want to replace a competitor's Wi Fi extender installed to allow our smart TV to wirelessly connect to my router/hub so we can use On Demand TV programme streaming.  With the current extender the picture/sound continually freezes.

I borrowed a friend's WN3000RP extender and re-configured it to operate in conjunction with my router/hub, and now everything works well.

On searching the internet to purchase a NetGear repeater of my own, I find that the following variants are available (and maybe there are more!):

WN3000RP, WN3000RP v2, WN3000RP v3, WN3000RP-100UKS, WN3000RP-200UKS.

How do I know which one is the best to buy for my situation? What is the fundamental difference between them?

Hope someone can help!