NFL free agent Kirk Cousins vs. Dolphins QB Ryan Tannehill: Who’s better?

Cameron Wake goes after Kirk Cousins in 2015. (Allen Eyestone/The Post)

Washington’s Kirk Cousins will hit the open market next month and could be the most coveted free agent available. Any team in need of a quarterback will be looking to get a meeting.

Cousins and Dolphins quarterback Ryan Tannehill were part of the same 2012 draft class, with Tannehill going No. 8 overall (third quarterback selected) and Cousins landing with Washington as a fourth-rounder at No. 102 (eighth quarterback). While their careers took much different paths as Tannehill started immediately and Cousins worked his way up from the bench, their career numbers aren’t far apart.

Cousins, who has three seasons as a full-time starter compared to Tannehill’s five, has a slight edge over him in most categories. He’s ahead in completion percentage (65.5 to 62.7), yards per game (261.4 to 239.7), yards per attempt (7.5 to 7) and passer rating (93.7 to 86.5).

In terms of touchdowns and interceptions, Tannehill has more of both. He’s got a 106-99 edge in touchdown passes, but has thrown 66 picks to Cousins’ 55. Tannehill’s percentage of passes that went for touchdowns is 4.0 (Cousins’ is 4.7) and 2.5 of his attempts have been intercepted (2.4 for Cousins).

Over the 2015 and ’16 seasons, Cousins completed 68.3 percent of his passes, averaged 283.8 yards per game, had 54 touchdowns against 23 interceptions and posted a 99.3 passer rating. The four players with a higher rating over those two seasons were Tom Brady, Matt Ryan, Drew Brees and Russell Wilson.

It likely works in Cousins’ favor that his career numbers aren’t weighed down by having to play right away, unless the assumption is that he would’ve been pro-ready earlier than Tannehill, and that he’s taken far less of a beating. Tannehill has been sacked 213 times in five seasons compared to 106 for Cousins.

Tannehill’s also much more of a mobile threat than Cousins, who is more of a traditional pocket passer.

The biggest disparity between these two is about to be their paycheck. Cousins will surely become one of the highest-paid quarterbacks in the league, and Tannehill’s $19.8 million salary cap hit for next season will rank 14th or lower. Spotrac estimates the market value contract for Kirk Cousins as a five-year deal worth $128.2 million.

Tannehill’s contract runs through 2020 with a cap hit of $21.5 million in 2019 and $19.5 million the final year.

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