Ultimately it comes down to personal preference and what you tolerate best. “Some runners find it difficult to chew and run at the same time. Others cannot tolerate the taste or texture of gels. Choose products with textures and flavors you like, that sit well in your stomach, help meet your carbohydrate needs, and logistically you can carry and open during [training and] a race,” says Baumann. For longer runs and races, you may even want to use a mix of different fueling products so that you don’t get too tired of one source.