There are pros and cons to both. If it came down to the absolute best look between the two, it would have to be aluminum siding. It is a more rigid panel and has crisper lines than vinyl siding. However, the draw backs are that it dents easily and the cost has risen significantly over recent years. Vinyl siding is the most commonly used siding by far, mostly because the material cost are lower. Vinyl siding is easier to install and maintain, however, there is huge difference in quality between many of the sidings that are on the market. Most manufacturers have six or seven different levels of quality in their product lines. We only use the top of the line vinyl sidings to ensure the best possible results.