I think either WAR has a value, but it's just relative. You can't just say "Warren is better because his fWAR is higher." Per Statcast, Bello has a pitching run value that's well above average and Warren's is well below average. Warren gets barrelled more often and induces less groundballs. Seems like Bello is a better bet going forward. fWAR has always had some "interesting" outliers (Kluber's 3.1 fWAR in '22, for example).