Ofcourse it is best to invest in bitcoin now cause i think it will keep increasing in the upcoming years until it reach it's peak and i think it's peak is anywhere near so we can say that it will keep increasing for up to 5 years more maybe but bitcoin price now is expensive so if you don't have much money i think it is better to invest in altcoin and i recommend ETH we can see it's potential and its not that expensive yet so it is the right time to buy eth now..
In fact it is always good to invest your money in bitcoin. because bitcoin is the best place from where you have more chances to make good money. in fact bitcoin is now becoming more popular and that is the reason that people are still interested to invest money in bitcoin. i think that very soon the price of bitcoin is going to cross 8000$ therefore i think that it is too much profitable to invest money in bitcoin.