Which type of solar cooker is the best?

Which type of solar cooker is the best? 
Panel
Cost (least,medium,most ) - most
Complexity - hard
Durability (1-10) - 7

Materials needed 

Panels ( cardboard ) 

Aluminum 

Pot 

Circular Metal stand 

String 

Hole puncher 

Box
Cost ( least, medium, most ) - least
Complexity - easy
Durability (1-10) - 9

Materials needed

Box

Aluminum

Parabolic

Cost ( least, medium, most ) - medium

Complexity- medium

Durability (1-10) - 6

Materials needed 

Aluminum

Cardboard

Stand ( wood ) or whatevs

Metal holder 

( Parobolic )

https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh-hnAtzYzGicjA4lZUopBhscrjQcZQ0HANkPp7aLyYU3IOMvDw72YTF-gpgz6AWST8Nm7g4cPzCKSADv7Ntekfcn4X1KGBEfm05sm4h4gCxpRXexoE6Fm4BvOa71xNTmpWbwBj0fxMl80/s1600/rudra+sk+14.JPG 

( Box )

http://mamaguru.com/wp-content/uploads/2013/04/solar-oven-005-640x491.jpg

( Panel )

http://solarcooking.org/images/scr/apr05/photor.jpg

As I  researched each box cooker, I believe that  the box cooker is the best. The complexity of the box cooker is fairly east but, the way it cooks food can help many people out. The box cooker is the most affordable, the most durable, and it's simple. The only con to this is that box cooker cooks really slow.

I also liked the parobolic cooker as well. The complexity of the parobolic is not as complex as the panel. ( my first decision ) I would call it the intermediate cooker. The in between of the panel and the box. The parobolic cooker is more expensive so not AS affordable ( depending on what you use ) . 

The parabolic cooks the fastest out of all of the cookers in my opinion.