Statistically. It just depends on which stats fit the narrative.
One can argue against any cold, hard stats, but here are some facts from 2022 (not 2017):
WAR -- Wacha 3.3, Kluber 0.7
W-L -- Wacha 11-2 for a last place team, Kluber 10-10 on a playoff team
ERA -- Wacha 3.32, Kluber 4.34 (that's like... a run per game)
WHIP -- Wacha 1.115, Kluber: 1.213
H9 -- Wacha 7.8, Kluber 9.8
Even if those numbers don't show a clear edge, age might make Wacha, 30, more attractive than Kluber, 36.
The Red Sox could use them both, anyway, when their other old and/or injured starters inevitably break down again.