for investment I recommend going to Altcoins, but for trading of course Bitcoin can be an option, the reason is very easy, that altcoins can make you achieve 100x profit on investment,
it's just that you have to really choose alrcoin investments which are good in terms of fundamentals , yes there are lots of potential altcoins, for example Nervos and Verasity,
try investing in these altcoins and wait for the bull market to come.
Why not for both Bitcoin and altcoins? It will be a good decision to buy both Bitcoin and some potential altcoins. We have to find our best altcoins because a lot of altcoins are offering high interest but all are not potential enough. In my opinion, investment on Bitcoin is comparatively safe than altcoins if we think about investment risk.