I have some ether in my portfolio so it's up there on my list of favorites, even though it isn't doing anything and is far away from its ATH.
I am the wrong person to discuss altcoins because I make an attempt to avoid them. I like the ability for traders to exit any positions in a coin and buy a stablecoin without that being considered a taxable event. You won't like my answer, but my favorite alts are therefore stablecoins.