I've decided on buying the Weber Spirit 310 grill. From what I've heard, it's the best bang for the buck and it will last for a long time. There are 2 models of the grill, one of which has porcelain flavorizers and cooking grates and one that has stainless steel. Are the stainless steel grates and flavorizers worth spending an extra $100 for? Is stainless that much more durable and easier to clean?