funny you should ask since the top X coins are actually not good projects at all. for example take 3 examples from the top 10 coins. ETH, XRP and BCH. all three of them are terrible projects. they are all centralized and useless. ETH is bloated, and filled with ICO scams and is only alive because it is pumped. XRP is not even used anywhere apart from exchanges and BCH is the creation of Roger Ver to make money nothing else.
Add in USDT and EOS to your list. Tether is currently imploding, it is probably not actually backed by USD as is claimed, its market cap is falling, it is still trading below $1, and there is still not even a hint of an external audit. EOS is a centralized scam, rampant with corruption and vote collisions, that exists only to rip off and steal from investors and make money for the 21 Block Producers.
In fact, of the top 10 coins, the only ones I would be buying right now are Bitcoin and Monero.