If you are considering the S9 Plus, maybe you should look at the A8 Plus. Pretty much the same specs.
https://m.gadgetsnow.com/compare-mobile-phones/samsung-galaxy-a8-plus-2018-vs-samsung-galaxy-s9-plus
https://m.gadgetsnow.com/compare-mobile-phones/samsung-galaxy-a8-plus-2018-vs-samsung-galaxy-s9-plus