@nemo you can use either carrot fiber in smoked meat products, but it is typically used in fresh. Where sure gel is typically used in cured products. Carrot fiber has a higher water holding capacity which will affect the time of your cook of cured products and may make it have a spongey texture. Sure gel holds some moisture but it also helps with protein extraction when making cured. If you have the opportunity try some Small batches and see what you like