You might also like to consider the number of eggs you want to hatch. I have a twelve egg incubator and I find that suits my needs very well. My first attempt was very disappointing after I lost some fully grown chicks, right on hatching as they were too wet. Since then I threw out the instructions that came with the incubator, and now I dry hatch. I usually get 100%. I can easily accommodate 12 chicks, but could not do more at a time without making a large brooder to look after them. I like to put my day olds under a broody hen and let her do the rearing. I find the chicks end up quieter that way.