These days, I like to look at xWOBA against for pitchers, to see if they've been lucky and/or helped/hurt by a great defense behind them. MLB average for pitchers is .318
Available - xWOBA 2019 (2018)
---National League---
Hamels - .333 (.339)
Hill - .271* (.307)
Wheeler - .303 (.278)
Wood - .370* (.293)
Roark - .336 (.318)
Keuchel - .325 (.295)
---American League---
Odorizzi - .299 (.338)
Miley - .297 (.307*)
Gibson - .330 (.316)
Porcello - .337 (.311)
Bailey - .320 (.366)
--Trash Heap---
Smyly - .368 (n/a)
---Blue Jays---
Thornton - .332 (n/a)
Shoemaker - .334* (2017: .352)
Waguespack - .351 (n/a)
* = small sample, don't trust these numbers
It won't take much for the available pitchers to be an upgrade to what we've got (am hoping for good seasons from Thornton, Kay and Shoemaker, and I'm assuming Zeuch and Wag suck).
I think the smart money would be on betting on Odorizzi (rise in FB velo) and/or Miley (now throws mostly cutters) as they'll be relatively cheap. I'd like the Jays to spend on Wheeler, but have no faith they'll take the risk. Let alone going after Ryu, or even Cole.