for the altcoins that are traded, I think that it is only feasible for a few altcoins, and of course bitcoin, with the spread of coins held by investors, it is less likely to be manipulated, considering that there are many new altcoins that are difficult to predict, especially from a chartist perspective, and for investing, I think altcoins the most viable top board, considering that this altcoin is the closest to bitcoin, so it will follow its movements, even the way to survive a bearish season will always be safe for the long term
manipulation happens in most low cap altcoins because they are the one who is easy to play with though even Bitcoin sometimes being questioned to be manipulated so yeah none are free from those playing .
But for me the net century Altcoins are the one who stands beside bitcoin all these years and yes , Ethereum is one of the best contented while Binance is now in the verge of having trouble .