It depends on how are you going to handle your investments in crypto. Buying at those top cryptocoins considered as a safety investments, less risk but the price is high and they are best in long term investments. Buying those cheaper altcoins are good also but it requires frequent monitoring at the market because price is not stable it may rise high but all of a sudden it may fall in an instant. I prefer to invest at lesser risk and that would be the top altcoins like ethereum, neo, litecoin, dash and monero.