API SN is fine for 2nz fe. But it would be good if you can use SP just to get that timing chain wear protection benefit. Majority of the engines have timing chain these days. As far as I know, only proton saga have timing belt if you check all the new vehicles these days
API SN Plus have no benefit for non-GDI engine
If you find API SN or SN Plus at much less price than API SP, then choose the former.