Lester, last 3 seasons: 4.03 era, 108 era+, 4.25 fip, 32 g per year, 178 innings per year, 1.38 whip, 8.3 k/9, 1.7 bWAR per year
Last year, EdRo was better than this. Sale had better FIP, WHIP, and k/9 numbers, but worse era, and only pitched 147.1 innings. Price had better FIP, WHIP, and k/9 numbers as well, but he only pitched 107.1 innings. Porcello was a catastrophe compared to Lester. Then they had 26 starts made by this group:
Velazquez (5.43 era)
Cashner (6.20 era)
Weber (5.09 era)
Johnson (6.02 era)
Smith (5.81 era)
I mean, anyone who wouldn't prefer Lester over this motley crew is crazy. So to me it all depends on $$$$$$.