As others have mentioned, Bitcoin is just known to be the first cryptocurrency and also for having the largest community and value over other cryptocurrencies. But I doubt that investors of it are having a better 'situation' over other tokens' investor. Things are the same because once a 'trend' is present, market prices moves as one. The only difference is the rate of increase ofcourse wherein other tokens have higher rate of increase but also higher volatility.
Bitcoin generally when it trends or whenever goes up its lift all other cryptos alongside him. So a good bitcoin projection means a good crypto market.
Not all the time. Sometimes trend comes from other currencies such as when ethereum way back 2020 had an increase and Bitcoin just followed but indeed BTC is a factor which makes the increase continuous. It is a matter of influence; its community size prolongs a trend either bullish or bearish.