The perfect texture for a soufflé is soft, fluffy, and aerated. They can be slightly wetter in the center but shouldn't be liquid or too gooey. Conversely they shouldn't be too dry when baked. Usually the edges will be soft and spongy with the center firm yet creamy, just a bit more moist than the edges. The perfect texture is often a matter of personal preference, as some may prefer theirs a bit jiggly and soft while others prefer a stiffer, firmer soufflé.