A year or two ago (much later than 2018) when I purchased my 9800 both were available and after evaluating and looking at specs and reviews I decided to go with the Plus. Earlier models have trouble with one side of the radio going bad, but I haven't heard any examples of this happening with the 9800 Plus.
If you have real concerns buy the cat, not the copycat: Yeasu 8900
I own an older 9800 with one side bad, a newer 9800 Plus and a Yeasu 8900 (the 9800 Plus Plus Plus, LOL)