The choice also depends on the amount of capital each investor has. You can invest in BTC or ETH if you're an investor with a large capital, as that's a safer choice. However, personally, I choose to invest in ARB because my capital is not very large, and ARB is a relatively safe option.
Whether we have altcoins that we trust most, that does not mean that we should rely on those coin projects when there are so many projects in the market we can invest in that would give us profits. Crypto market is big enough for us to make profits from it but we have to have a skill for us to understand how the market works. Whether we are traders or non traders, we need to make sure we do things that that would help us achieve more in the market.