Flex links or Switch Stacking

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could you please share your thought about best recommendation using Flex links or  Switch Stacking  ?

what is the benefits from each Technology & best practice for it ?

[balaji.bandi]

Flex links : 

Flex Links are a pair of a Layer 2 interfaces (switch ports or port channels) where one interface is configured to act as a backup to the other.

Switch Stacking: 

A switch stack is a set of up to 8 switches connected through their stacking ports. The switch that controls the operation of the stack is the stack master. you need stack cables to connect.

BB