bWAR last 4 yrs (2020, 2019...)
Porcello: 0.1, 1.2, 3.0, -0.2= 4.5
J Lester: -0.2, 1.4, 3.0, 0.6= 4.8
fWAR 2019-2020 (both had 233 IP)
3.4 Porcello
3.0 Lester
2018-2020
5.9 Porcello (425 IP)
5.0 Lester (414 IP)
2017-2020
7.9 Lester (595 IP)
7.9 Porcello (628 IP)
With Porcello being significantly younger, it looks like he'd be the better deal.
I'm not so sure.