Linseed oil is used in exterior applications only and creates a flexible oil film that aids in preserving weathered wood. Alkyd is used in both interior and exterior paint. Alkyd resin is very durable and forms a hard film commonly used for heavy duty applications. Acrylic resin in trade coatings is a waterborne latex. Acrylic is used almost exclusively for exterior paint coatings.
Acrylic paint is a very flexible and weather-resistant paint for exterior use.
There are oil base acrylics used in the automotive industry, but those should not be confused with acrylic house paints. PVA is short for Poly-Vinyl Acetate. This is also a waterborne resin used mainly in interior paints. PVA can be used in exterior paints either by itself, or in combination with acrylic. Exterior moisture resistance and weathering of PVA will not be as good as acrylic.