The best one you can afford is likely to be the short answer. If you go over 2.5" you can expect to have to modify your driveline, as there is a driveshaft boot issue and a relocation of Y-pipe from your exhaust at 3" I believe, and thats the beginning.
CRDSTU, AEV, DBOR, OME, Mopar, Ironman, etc. all seem to offer what 'they' say is the best for your vehicle and will make the road feel like its perfectly flat and your wheels will flex over Ayers Rock. I'm sure they are all correct, but it depends on the person driving, the type of driving, the terrain, the speed, the wheels and tyres, the ambient temperature, etc.
I still can't decide. I'm waiting out as long as I can, and have only put on a
Teraflex levelling kit until I can make up my mind.
Pick the kit that suits your driving style, the type of terrain you are likely to be travelling on, and the speed you plan to travel (i.e. outback dirt roads with 250kg on board at 100km/h requires different shocks and springs than fire trails in the local National Park with a picnic basket)