SIG LT 40 kit vs. ARF complexity
It's a Sig kit, you open a bottle of glue, pour it in the box, shake it, and the kit will build itself. Well, maybe not that easy, but the Sig kits are VERY easy to build. My Sig Somethin Extra was my first kit EVER to build. I built it, covered it, and flew it in less than a week. I would go with the kit. You'll like it much better when you are done. Besides, that way you'll get some building experience that you can't gain with an ARF.