Inspite of numerous alternative coins coming out in the crypto world, I still believe that bitcoin is the best coin among all others. It has set the standard in the cryptocurrency as it is the first ever digital currency ever known and released. It still has the most promising value increase (just look at its growth on the chart) that attracts investors. Also, valuenof altcoins are still dependent on the value of btc so basically it is the basis of the crypto industry.
For now you are right but it doesn't necessarily mean bitcoin will always dominate and its flaws are becoming increasingly apparent with huge transaction fees at the moment making it unusable for anything but high value transfers.