WD19 Docking Station - Features

Hello everyone,
I have some questions about the WD19 Docking Station.

130W vs 180W
What changes between the 130W and 180W versions? Are they both able to properly power a Dell XPS 15 or a 16" MacBook Pro?

Power button
What is the button on the top of the dock for? Does it allow you to turn on your laptop when it is totally off (even with the lid closed) or just wake it up from standby?

Thunderbolt 3 vs Normal version
What does the TB version with Thunderbolt 3 allow you to do?

I hope you can help me. Unfortunately I struggle to find accurate information.

Thank you,
Gioele