BetMGM vs ISI Sportsbook in South Dakota
BetMGM and ISI are two of the three sportsbook technology providers operating in South Dakota. They sit at opposite ends of the operator spectrum: BetMGM is a major national brand with a polished mobile app (geo-fenced to its two partner casinos), while ISI is a specialty B2B platform built for smaller-market casinos without national operator partnerships. Here's how they compare side-by-side.
Side-by-Side
| BetMGM | ISI | |
|---|---|---|
| Type | Major national operator | Specialty B2B platform |
| Partner Casinos in SD | Tin Lizzie, Cadillac Jack's | Mustang Sally's, Gold Dust |
| Number of Partners | 2 | 2 |
| Mobile App | Yes (geo-fenced on-property) | No |
| Self-Service Kiosks | Yes | Yes |
| Over-the-Counter | Yes | Yes |
| Parent Company | MGM Resorts + Entain | Independent (private) |
| Market Depth | Deep — full props, SGP, futures | Standard — game lines, totals, basic props |
| Same-Game Parlay | Yes | Limited |
| Player Props | Full slate | Limited to top markets |
| Launched in SD | Sep 9, 2021 | 2021 |
Best For
BetMGM
Serious bettors, player props, mobile app users, SGP fans
ISI
Casual bettors, historic-property visitors, simple game lines
Verdict
If you want the deepest betting markets, most prop options, and a mobile app for in-casino wagering, BetMGM (at Tin Lizzie or Cadillac Jack's) is the clear choice. If you want a smaller-volume retail experience at a historic Main Street property without the BetMGM brand experience, ISI (at Mustang Sally's or Gold Dust) is perfectly adequate. Most experienced sports bettors visiting Deadwood prefer the BetMGM books for the deeper markets.