The 4230 has a better wide front axle than a 4020. I like the operator's station on the 30 series better than the 20 series. There is no comparision between the cabs.
If some of your tillage equipment works your 4320 hard in 3rd & 4th gear, then they may be too much for a 4230.
Has the 4230 engine been overhauled? There were update kits that improved the hard starting problems.