If it's among alternaternative coins,I think etherium is the best altcoin. Etherium is believed to be next to Bitcoin which is the top crypto for a long time. Etherium may not have the largest market value among altcoins but its large community of users is its biggest advantage. It is a good to invest altcoin because the market value of it is now low due to the continuous dumps early this year and for having a high chance to recover later this year.