The shape of dildo that you choose depends mostly on personal preference and function.
Some dildos look like realistic penises, some look like animals or goddesses, or ice cream cones. Dildos can be shaped for g-spot stimulation, for prostate stimulation or completely straight.
If this is your first dildo you may want to start with something generic, or if you know you like a certain kind of stimulation, look for something that is recommended for that use.
If you are going to be using your dildo on someone else, remember to think about what they like, and you may want to avoid the more unusual shapes, as it might hinder the amount of movement you can have when using the dildo on a partner.
