my 99 has the one piece. I figured the 2 piece probably started in 2003 with the interior update maybe?
I HATE pulling the 1 piece console. The bottom is wider than the gap between the seats so you really have to find the right position and sequence to get it all in around the seats, the seatbelts, parking brake lever, and both shifters. I've broken off the little brush around the transfer case lever from manhandling it too hard...twice. Got some quicker setting epoxy to reattach it this time so I don't have to wait a day to reinstall again.
I also don't like that the one-piece doesn't have a removable cupholder insert, so the cupholders are harder to clean when they get nasty.