Bitcoin is pretty strong compared to others cryptos.
Bitcoin has a market cap of 93 billion $, ETH (2nd highes market cap) = 31 billion $.
Those 2 coins, together, represent more than 90% of cryptocoins (in terms of market cap).
With Bitcoin leading this statistic, you can be pretty sure Bitcoin is "quite strong" compared to other cryptocurrencies.
If you want to look for the exact Numbers, you can look here:
https://coinmarketcap.com/coins/