Welp you asked. My 2 cents.
I use OEM because I don't race and or use slicks. All the beefy aftermarket clips just hurt after a few hours of riding, but also if something is stiff beyond your needs/ability it takes feel away ultimately. Like anything you're attached to, "feel" is a result of things flexing a bit to give you feedback, tires, frame, forks and to a lesser extent the clips ons all flex and that all combines in the form of feedback. I had woodcraft on my R6 and put the OEM back on after a few months.
People just automatically think stiffer is better and mind you the thinking was even at the top levels of the sport in the late 90s to early 00s. In GP racing the bikes were getting so incredibly stiff because that's what the engineers thought would make for a more consistent chassis. The riders however (and we are talking the worlds very best) complained that the feel was gone and they had trouble telling where the limit was. In a sense the rider is a strain gauge and he needs things to move a little bit in order to get a feel of what the bike is doing.