in regards to one day cricket i think the weststern division is really poor, look at the 2020 gloucs get spanked by a poor surrey side, kent stuff somerset, i think essex kent surrey and sussex would top the western leauge, even middlesex might win a game.
but a couple of years ago you could have taken any side out of the western division (perhaps with the exception of somerset) and they would have won any one-day group or title going
its swings and roundabouts
edit: pour example, if you name the best modern day one day sides they are undoubtedly, warwickshire, lancashire, gloucestershire and glamorgan, and maybe surrey as well.