In terms of a Stock motor the R18 since it isnt a high compression motor, and takes pretty basic oil i would stick with regular oil.
but if i decided to chose the type S motor i would deff go for full syntenic oil maybe along the lines of Motul! Im a huge fan of motul and honda cars do end up burning quiet a bit more oil than all other car companies. Thats why i would choose motul spend the extra money for protection and quality!