A high quality suspension lift is designed to make your Jeep better than stock. Tougher, more flexible, better offroad, with either no compromise, or very little compromise, to street handling.
A budget boost is designed to space out your springs a bit, and give you a little more room for bigger tires. There's nothing wrong with that (I have one), just don't expect anything more.
doclouie is absolutely correct to point out that a suspension lift can also bring a whole slew of other things you need to solve, and that always equals more money.