Spacer-wise, they all pretty much use the same polyurethane material for the spacer so the real decision is what brand shock absorber will you be getting in the kit. Some shocks like the ProComp ES-3000, Rubicon Express twin-tube, and Rough Country will make the ride pretty darned stiff.
And any change to the suspension height will change the toe-in and rotate the steering wheel slightly to the right so you must immediately, no delay, correct the toe-in back to where it should be. Then it's a simple matter to correct the steering wheel's position back to where it needs to be.
Doing both at home are easy and you can with just a tape measure, really, set your own front-end's toe-in just as accurately as the latest whiz-bang laser-guided alignment rack with the world's most experienced alignment guy can.
Here's how... Basic Jeep Front End Alignment
And in a few minutes, I'll post a few pics that show an enhanced way of measuring between your front tires to more easily set your toe-in. Basically you are simply adjusting (rotating) the tie-rod until the front edges of the tires are 1/16" closer together in front than they are in the rear.
Edit: Here are the photos that simply show a pair of 1" square steel or aluminum tubes marked at points equal to your tire diameter. Use a couple spring clamps to hold them centered on your rotor and simply rotate the tie rod until the front is 1/16" closer together than it is at the rear. You will then have set your toe-in properly and quite accurately.
Straightening your steering wheel is even easier, how to do that is in that link I gave above.
In other words, there is zero need to take your Jeep to the alignment shop after you install your BB. And yes, you need to do both for even a 2" BB.