A latex mattress from a major retailer can cost anywhere from $1,000 for a twin size to $5,000 for a high-end king size (2010 prices). A memory-foam mattress from a major retailer ranges from $750 for a twin mattress to $3500 for a high-quality king mattress.
The greatest benefit of both latex and memory foam is that neither creates pressure points, because they do not have springs and both materials conform to your body.
It's easier to move on a latex mattress because the latex material quickly returns to its original shape, and latex can be layered to create different levels of firmness. Memory foam mattresses provide superior support with no sagging, and you can move on a memory foam mattress without disturbing your partner.
Both latex and memory foam mattresses are heavy and can be difficult to move. If latex mattresses aren't high-quality, they can become lumpy. Memory foam mattresses retain heat and can be too hot in warm environments and too firm in cold environments.
Although both latex and memory foam mattresses cost more than traditional mattresses. Many also last longer and come with longer warranties, so the cost over time can be similar. Consider the warranty length before buying a mattress.