house insulation question...

[yellowjacket]

Hey guys... figure someone one here may have expieriences with house insulation.

Im building a new home....builder is putting r21 batts in the walls.

Or i can upgrade to the sprayed in insulation.the kind that goes on wet,and fills the cavities between the studs.after a week it dries and can be covered. It is 1500 more for the house for this type.builder says the r value is the same but it performs better.which im sure it does. 1500 isent very much in my mind if it does a better job.

But then my neighbor came over and told me what he has in his wals.i think he called it icing(?) .it looks like sprayed on foam,only about half inchs worth,then batts over that. It looks impressive. Builder dident give me that option but im curious.

Any expeirience on here? Idk if it matters,but house is 2x6 with brick exterior.

Thanks for any advice.