colyster best ice pokemon

They said offensive pokemon and Cloyster has a higher attack stat according to this site: https://thesilphroad.com/research

Maybe Lapras would be better if u cant dodge or simply because of stardust efficiency.

Well, "dps" is damage per second, meaning that total damage is dependent upon, among other things, seconds in battle. Lapras has slightly less base attack and defense, but A LOT more HP.

Its higher CP strictly overstates the "CP betterness" of Lapras though, as its higher HP is a visible stat but the CP stat also aggregates its HP.