Personal opinion? The stock air box is about the best thing on the market except for a snorkel. As far as a true cold air intake goes.
A stock air box picks up its cold air out by the radiator, which is cooler air than a CAI, which gets its air from inside the engine compartment.
A stock air box is basically sealed from the elements, and a CAI is an open conical filter, which allows the first puddle that you splash through to give your motor a cool drink of water.
Rugged Ridge makes a cool looking unit. That is if you plan on being a mall crawler, and don't go off road with it. Even a bad rain storm will allow the tires to spray water up enough to give the motor some moistness.
So, there is my personal opinion. Don't bother with wasting your money on a cold air intake unless you are going the full route of putting a snorkel on it. And then all you need is a snorkel kit that is attached to your stock air box. A CAI, works for what it is designed for, a rice grinder on the street. It isn't designed for a Jeep in the mud.
'87 YJ, 4.2L built and bored, 8.5" of lift, 8.8 rear, AX15/NP 231, Tom Woods drive shafts, Flat fenders, 12,000LB winch, Custom bumpers, Rattle can paint job. Never completed...