I agree with you. I also feel that investing in bitcoin is safer than investing in other coins. as a layman, I feel that bitcoin is a popular coin and is the king of coins, so there is no doubt on bitcoin, even though we also have to remain cautious in investing in bitcoin, because in all jobs certainly have risks to be faced.
First of all, bitcoin is better to invest on in terms of other coin is because of reliability. It is popular because it is the first crypto currency to be made and is some what perfect with little flaws that we can overcome as it keeps on developing. In the long run, it is guaranteed to give you a good profit unlike other alt coins which are extremely volatile. Secondly, investment is not a form of job. So do not consider investing on crypto currency as a full time job, since it is no way a reliable source of income.