bitcoin is better becuase its the first and original coin and some coins are just a copy paste, the value of bitcoin is much higher compared to other coins and more people using bitcoins. although bitcoin has still some disadvantages like higher transaction fees.
Its first of its kind, bitcoin is more popular then any other alt, and all casinos are bitcoin casinos that accepts other alts. When ever I see something about transaction fees I need to quote and support that, fees are incredibly high and I wonder will we ever see normal fees again, like in beginning low transactions fees, cheaper then banks. I'm telling that most of us have problem with high fees, not all of us are rich and high rollers.
Bitcoin is better then other alts, and even with high fees bitcoin doesn't lose popularity. Other alts are here just to earn more bitcoins with them if you know how.