Which Shelley for under counter lighting?

I am installing under counter lighting in the kitchen, powered from electrical boxes I had installed in my cabinets. After reading a lot of the threads on under counter lighting, I think putting in a Shelley is the way to go for my use case.

But which Shelley? There are so many, Gen 3, Gen 4, PM. I just want to be able to turn the lights on and off and dim them.

Thanks!