Obviously they are safer for top 20 altcoins.Because they aren't the shitcoins and they aren't pump and dump coins.
What do you think about BitcoinSV? Seems like a shitcoin to me. Specially with what its creator Craig Wright say.
How you advice work, when an altcoin gets pumped or its dev fail heavily? Alt will fly away from top20 next day or a new will appear there for few days.
Imho - with proper research, buy anything and be safe.