Investing in both Bitcoin and altcoins are very good idea. But before investing we have to aware about the best altcoins , which is good and long lasting. Because some coins are disable quickly after some time. There is no risk in investing bitcoin, because it a larger and well established cryptocurrency. Bitcoin is more safer and stable investment than altcoins. Before you invest in altcoins you have to check whether it is best coin to invest because some altcoins gives high profit returns but with higher risk. So choose best altcoins before invest.
The best altcoins in my opinion are ETH and BNB of course they have maintained their position at the top and these altcoins have a real use while for ETH it is wider in the ecosystem and BNB is having a big exchange right now.
If you compare, of course bitcoin is better, but you have to wait patiently to invest in bitcoin and it will not be easy to produce if it only takes a moment and it takes years.