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Kody Brown opens up to PEOPLE about why his time on Special Forces: World's Toughest Test was more enjoyable than filming Sister Wives

He praised the competition series for being "life-affirming," while he called the TLC show "an experience of criticism and backbiting"

In its 15 years on the air, Sister Wives has shown the demise of his plural marriage with Meri, Janelle, Christine and Robyn Brown, who is the only one he is still married to

Kody Brown is getting honest about how his experience on Sister Wives has changed over the years.

As the long-running TLC series heads into its 20th season , the family patriarch, 56, is branching out into another realm of reality television with Special Forces: World’s Toughest Test . He tells PEOPLE that the two shows

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