Building a garage, cooling and insulation recs!

Hey everyone.

Building a 48×36 garage, with 2 sections: 1. 32×36 garage with 16’ high walls 2. 16×36 space for golf sim, 12’ high walls 2×6 construction

Curious what makes the most sense for insulation. Off the cuff, I’m thinking rockwool in the golf sim section. I’ve heard good sound properties and awesome insulation.

Standard (cheap) fiberglass in main garage section.

For cooling, honestly considering window units. (1) 18k for each section. The golf sim section will def get more use and would be adequately sized. The garage section would only be when working on projects, and I could fire it up an hour before going out there.

Previously, I gutted a 20×30 garage and did 3” closed cell in the walls, and 6” open cell in roof rafters. Cooled the whole thing with 18k mini split (Mr. Cool diy). Mini split crapped out multiple times in a 5 yr time span.

My brother has a 30×40 shop, only 1/4” foam sheets between post frame and metal siding. Single 18k window unit cools the the whole thing as-needed (doesn’t constantly run it).

So, spray foam is cost prohibitive with new garage based on scale. I’ll use ridge vent and soffit vents to properly ventilate the trussed cieling, then use normal insulation between trusses (joists) with a finished cieling.

Questions: 1. Do I get faced bat insulation? 2. Which direction does facing go? 3. In lieu of faced, should I staple on moister barrier (plastic) over the whole wall behind sheathing material? 4. Thoughts on window units vs mini splits? Third the cost with good results and longevity from my experience.