My goals were to maintain the car balance and decrease body roll.
If you upgrade both front and rear at the same time I think you can achieve that.
I did feel some understeer with just the larger front swaybar, but not a great amount. And I pushed my car pretty hard into some corners when I first got the front swaybar installed.
I believe if we were talking just FWD or just RWD the oversteer/understeer equation becomes much greater. I just didn't notice that big of a change in either direction. I just noticed a significant reduction in body roll.
I've been meaning to set my rear sway bar to the max 22mm to see if there is a change in feel, but I like the way the car handles now, so I've been too lazy to experiment.