The side plate is designed to protect all of your main components in your quad and is also designed to be used with reversed propellers.
This provides nearly full coverage from rain and dirt and is also quick and easy to attach to the frame with only 2 bolts.
Side plate full is designed to wrap under the Esc 4 in 1 to provide more cover.
While the normal side plate is just a cover wall.
I would recommend to use the full side plate.
The new slim version is the same as the full version but just have a lower profile design.
This version depends on how you have built your quad and what components that you have used. If your 4 in 1 ESC sticks out anymore that a standard size 4 in 1 when this version my not be the best for you. So i would recommend the older Full side plate.
The new Aerodynamic version still has the same amount of coverage as the older Full version does but this version has a less dramatic edge from the top plate down to increase the air flow and handling.
To make it easier to print, Print this version top side up with support so that the curve on the outside will look better
To print both sides. Mirror the side cover.