Honestly I would have to go around and look at every other Casino to give you a non BS answer for how we are not different.
But I can answer the second part with no problem.

RiverBoatBitcoin.com has a couple of key strategies to gain a large market share.

Our first and primary goal will be to gain new players with constant returns. We will go about this in a couple of ways, the first and foremost being the most important MARKETING MARKETING MARKETING. The second will be to offer payments not just in BTC but many other payment types as well. We currently offer Moneybookers/skrill, webmoney/Z/R/U/E, Perfect Money, OKPAY , Wallet One, Qiwi. We understand everyone does not have bitcoins all the time and it can sometimes be a hassle to get them.
We will also be adding and changing our games around to keep a feel of freshness to our Casino, people get tired of the same old stale games and enjoy some choices.
Most of the other Casinos have either limited games not a full array, we offer a full array of table games and slot machines for our players to choose from.
We offer 24hr 365 days a year customer support, the tickets will be answered. Customer always come first! They pay the bills!
But like any business you will have competitors, we will strive be better then them in every way we possibly can to gain the trust and loyalty of our customers.

Thanks
        RiverBoatBTC