1. On road manors. JJ felt tighter and more controlled but only slightly. We are talking JJ short arm TJ vs MC long arm LJ. Mostly talking over bumps at speed, or a quick lane change. Not a real scientific comparison, but I used my butt-o-meter and the TJ was crisp, the LJ feel a little floppy. Could just be the Antirock front and rear on the LJ.
2. In the JJ the ball is free to move around without restriction (Probably the biggest advantage). MC relies on the bushing to rotate in the housing. Once the grease dries up it binds and wears the bushing out.
3. JJ are pretty much bullet proof and when they start making noise, you disassemble and add a little grease. MC joints will begin to crack as the rubber deteriorates and will need new bushings installed. Even if you are on top of maintenance rubber only lasts so long. The plastic races in the JJ seems to live a long long life.
4. Both are pretty much a pain in the ass to service. Remove joints, disassemble, grease, reassemble, reinstall. JJ maybe more since its under tension and requires specials tools, or a home made tool or press and creativity.
I bought a Jeep with pretty much the whole MC catalog on it. IMHO its not that their stuff is bad, its just overhyped and they have a pretty good marketing team pushing it online and on social media. There are also a lot of keyboard warriors online who just wanna bash your rig and your parts. I have to say, my experience with MC customer service has been amazing. Anyone ever talk about CS from some of the most touted brands on here? Nope.... lucky if you get them to answer the phone.
I was missing some bolts in my armor, keep in mind I didn't even buy it. It was installed by the PO. MC shipped me what I needed free of charge and was happy to do it. Another time I was being a dumbass and pounding a ledge I "thought" I should be able to get up. I am talking, braking with throttle to bring in the boost on the supercharger and full send it. I bent both my front lower links where they screw into the lower arms. They sent me two new ones with longer threads to try and said if it happens again to call back. We never see that happen, but here's some free parts to try out. Called the other day to check stock on a slim crawler rear bumper. They said they have some in power coating and its 2-3 weeks, but how about 10% off if you order one? Sold, send it to me.
That being said I bought my Jeep with a vision of what I wanted it to be. I got it for a reasonable price considering the parts it had on it. I plan to replace some of them and build it into what I want it to be in time. In the mean time its more capable than I am most of the time, and when I am ready, and can afford to dump $30k into, we will go to the next level, or maybe skip a few and go nuts. So far I am really enjoying the MC LJ. I did peel all there stickers though. You don't don't get stickers on my rig unless the parts are discounted or free. So far I have a BFG sticker on both fenders