With a 3" suspension lift, you'll most likely need a slip yoke eliminator (sye). 2" should be fine, just need shocks and springs. You can do a combo lift, by doing a 1" body lift and 2" suspension lift and a motor mount lift (mml). This requires more labor. If you have the time to do it yourself, then go for it.
It really depends on your plans for the Jeep. Are you gonna run bigger tires? What size? Will you be going off road or just staying on the pavement? These factors will be huge in deciding what lift is better for you.
Mod, please move to tech.
03 TJ Rubicon