Poles vs Blades?

Yes, I’ve searched. Could someone please tell me why some people use Power Pole Blades and others use the Power Poles? I’m sure it’s something simple but I see both types on our lake and just wondered why the choice?

It's a personal taste thing. The blades are a little thinner and looks more aerodynamic. The hardware used is a little tougher/stronger than the original power poles.

I had no clue. I thought one may be used in sand and the other in rocks or maybe as a type of sea anchor in deep water?

Blades are a little more expensive.