They're very similar at first glance. One advantage of Poppl Laudatio, it has a companion serif family, Poppl Pontifex. But both are dated typefaces in terms of features. The newest version of Optima (Optima Nova) has a broader character set, including true small capitals. But, wow, the type family costs $1422. I think the only way I'm going to be using that any time soon is if Adobe pays Monotype to add it to their Adobe Fonts service.