I agree.
There are many other aspects to consider when deciding where to invest.
Experience in the development and mgmt team.
Pre-mined coins.
Distribution of coins.
Inflation.
Liquidity.
Project growth potential.

Just as with any other investment, you have to know as much as you can about the project and then decide at your own risk. Marketcap is just one variable and not the most relevant one.

Just read about Ripple Co-founder selling all those coins lately...

That's why many BTC maximalists call them shitcoins,,,,,just marketing the founders do to get rich at the expense of uninformed investors.

Trader's is a different story, they just get in to get out, not for the long term.