iPhone vs Samsung, Android vs iOS, BMW vs Mercedes .... 
Those are products we're talking about a currency.
There is no real dollar versus euro competition except for people betting on them. Both sides want their currency to be lower to boos exports and limit imports.
And besides that there is no rule that we must have competition in every field.
Google vs...bing ? lol
Facebook vs...I don't even know an alternative
Amazon vs..
Bitcoin vs Ethereum. Yes its true. Ethereum has all possibilities to compete with Bitcoin and if you can see it has almost 20+% of the marketcap share while bitcoin reduced to 50% from 80% over the past 2 years.
Market cap does not mean anything...
There is one store accepting eth for every thousand that is accepting bitcoins.
Most of the people that have heard of crypto believe bitcoin is the only cryptocoin out there.
Inflated market cap with a premined 60 million out of 90 is not relevant.