The thing about Tex was he was signed to a superstar contract and he produced like . . .
erth? We have a bit of "whose WAR is it, anyway?" when talking Tex at the NYY. fWAR has him, in descending order of WAR, at 5.1, 4.3, 3.4, 2.9, 2.8, 1.0, -0.1, and -1.3. Werth had two very good years with the Nats at 5.0 and 4.7, but also 2.3, 1.3 (2016), and 0.7, and -0.3. Equal peak, better trough, but fewer middling years.
7/$126MM > 8/$180MM, I/M/O. In terms of WAR, Werth has been $108 MM for 13.7 WAR (~8MM per win), while Tex has been $180 for 18.1 WAR (~$10MM per win).