Sriracha and sweet chili sauce are two different things. Where sriracha packs an element of heat, sweet chili sauce is dominated with a sweet garlic taste. Apart from being a lot less chili, the flavor profile is almost the same, but keep in mind that sriracha sauce is different from tabasco or any other hot sauce. It is much thicker with a strong hint of garlic and sugar, particularly the Huy Fong variety that is most popular.