More new development would take place around the Parx site than around MGM's or Penn National's proposed locations, which are in built-up areas, he said. And Greenwood's site would be integrated with the economies of the surrounding communities, he said, unlike National Harbor, which he sees mainly as a destination for tourists.

"They're a very serious competitor by way of the track record they've established," Karmel said of Greenwood. Even so, he said, he sees MGM's location and Penn National's connection to horse racing as potentially persuasive to the committee.

The depth of the competitors' existing customer databases is not likely to have a significant effect on their abilities to market the facility, Schwartz said. Players who live in or are visiting Washington and regularly play at MGM or Penn National casinos might be more likely to gamble in Prince George's County if they can earn customer rewards points, he said, but most of the casino's business, whoever runs it, will come from the Washington region.

There's no incentive to bring their players from lower-tax jurisdictions to Maryland, he said.

"You're going to make your money from the Greater D.C. area, and that is a very large and affluent population," Karmel said. "That is enough to make the casino very lucrative."

MGM National Harbor

Location: National Harbor

Ownership: MGM National Harbor LLC, a subsidiary of MGM Resorts International

Number of slots proposed: 3,600

Number of table games proposed: 140

Selling points: Location; company's record

Projected cost of facility: $800 million

Projected job creation: 2,000 construction jobs; 4,000 permanent jobs to operate the resort plus 4,400 incidental jobs at other community businesses.

Hollywood Casino Resort at Rosecroft Raceway

Location: Rosecroft Raceway

Ownership: Prince George's Racing Ventures LLC, a subsidiary of Penn National Gaming Inc.

Number of slots proposed: 500

Number of table games proposed: 140