Either would be fine as they are probably the two best exterior coatings money can buy. As mentioned by footprints, use the filter 7 over the HLS if it's going over new timber. As he also said, Allcoat is a solid paint and the Sikkens is a woodstain, Allcoat is incredible stuff and with proper prep will last for years, Sikkens HLS and filter 7 is the best exterior woodstain system I've seen.