Yes bitcoin is the best place to invest your money as the demand of bitcoins is increasing and it will continue to increase in coming time too which will help in taking price much higher as bitcoin is gaining more popularity now and its also getting attention from new companies and investors which will led to much higher price in future so if you invest in it now then you can expect best profits in future.
Bitcoin should continue to become more valuable over time. It is probably the least risky of the cryptocurrencies to invest in because it is more established than any of the others. There's probably no bad time to buy Bitcoins but I would recommend waiting for drops in price to make sure you're getting the most for your money. Many of the top altcoins are probably good investments as well although some of them may not last long term. That's why you should stick with the major coins mostly.
I think people are more interested to investing on bitcoin because more valuable over time than altcoin which more risk. There is no guarantee if altcoin more valuable over time like bitcoin. Bitcoin is not like it used to be, now many people know and the price continues to reach a new record.