The difference is the fabric. The twill is 3 layers, much thicker and has a very different appearance.
Search around on Craigslist before you purchase. You can very often find brand new takeoffs from someone that purchased the dual top option and don't want the soft top. Around my area, you can find premiums between $700 & $1000 regularly.
Not sure where in Indiana you are, but I pulled up Indianapolis and found a standard top
Jeep Wrangler Unlimited Soft Top (never used)
If you keep checking, and expand to different cities near you, you'll probably find what you're looking for at significant savings.
I have had both standard and premium. Like the premium much more.