Depending on what is there plowing, most of the time the 189's are very beneficial to have there to finish of lands. It seems most times you'll end up with lands with points at one end, and multiple furrow widths at the other that need to be finished up. But turning around in already plowed ground can be rough for the little tractors to do if some tractors have 16" or 18" bottoms. Or multiple rounds needed when someone miscalculated laying off a land that has an edge to the field. That means multiple rounds of deadheading to get the one edge cleaned up.
The 193 would probably get you more plowing time in line with everyone else. Guarantee there will still be points that need plowed off, and most likely one side when at a fields edge will need finished up. Where we plow, they usually leave that up to the smaller tractors to finish up.
We usually have sections for the smaller 1 bottom tractors to plow in so we're not holding up the big dogs.
Whatever you decide, make sure you have a good share on the plow and get it adjusted to plow. I can't tell you how many times we've plowed, and a newbie shows up, drops the plow and never looks back. And most of the time they have a plow that the share is worn out and won't engage the ground. At best they leave a little groove and gather up an enormous amount of bean stubble. They may finally notice, then picked the plow up, unload it and leave for someone else to deal with. And seems once they get it cleaned out, continue what they were doing before. DON'T BE THAT GUY..!!
Most generally everyone needs to do a little tweaking to get their plows set, but just going a short distance then adjust is the way to go to get things set. That is understandable, and most are doing the same thing then everyone is good to go for the rest of the day.