Sintered base is a must on a pow board. Only time I would say it doesn't matter is for a beginner that won't notice the difference and on park boards that are going to get destroyed anyways.
15 LibTech TRS HP . 15 NS Snowtrooper . 15 NS Ripsaw . 13 Salomon Pow Snake
14 Now Drive . 13 Now IPO
14 Flow Hylite