It really depends on what you’re looking for in a mattress. Hybrids tend to provide more bounce, while memory foam offers more body-contouring. In general, hybrids tend to be more durable because of their strong coils, but there are many memory foam mattresses offering competitive durability with high-density foams.
As a general rule, you should opt for memory foam if you want to sink into the bed, and choose a hybrid if you want more mobility. However, if you can't decide, you may want to opt for a memory foam hybrid, which offers the best of both worlds.