Depends on budget and function.
G2 is an aluminum top skin and bottom skin. Fibermax is a fiberglass top skin. It doesn't dent, or get quite as hot to the touch. I have the higher model, the F1, and really like it's flush hinges, etc. Got mine from a vendor on another forum for less than what the Fibermax retails for in most places.

Had to warranty my first cover after 11 months, due to no one's fault, and Bak was very helpful in getting me a new cover in less than a week.

 

I bought the G2. It's still on the truck. Even tho I sold it [emoji22]


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I love my F1 and it is over 3 years old now.

 

I love my roll-n-lock even though i just installed it a month ago...my dad had one on his 2002 F250...always loved it and it worked flawlessly for years...hope mine does!!

 

Getting ready they a Peragon shortly. $699 can't beat it and secure.

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You can't go wrong with Bakflip cover. If you need a cheaper alternative, take a look at the Undercover Flex.