Sorry man, everyone is entitled to their own opinions, There is a very good reason that you or virtually no one else has ever broken a stock Rubicon locker. ARB lockers are a very well built, very stout product, However, the Rubicon stock lockers are every bit as good as, if not better than the ARB units, unless one is into heavy duty rock crawling and huge tires, which I believe the OP is not.
To the OP, a lifetime ago I was in your very situation. I had a TJ with the very weak dana 35 with the 3.72 gearing. I wanted stronger and lockable axles. When all was said and done, it ended up being way less expensive, "over the long term", for me to sell the TJ and purchase a Rubicon with the 44s , 4:11s and lockers. That vehicle served us well for over 125,000 miles. I very rarely engaged the front locker and when I did I was sure to be going relatively straight. The front axle U-joints are the weak link on those jeeps and need to be replaced about every 50-75 thousand miles with normal use. If you're avidly rock crawling or doing a ton of deep water crossings than the carnage gets even worse and you'll be wanting to upgrade the entire front axle assembly. Having said this though, I eventually threw in the proverbial towel as it just isn't possible to modify a jeep to be a Landcruiser. We bought our cruiser then sold the rubi. I mentioned "long term" above because we sold the rubi for more than the cruiser cost, way more. TJ Rubies just don't loose their value. Nor do Landcruisers. Good luck with your decision.