Terrence Ferguson, DVM, and Vernard Hodges, DVM, of Nat Geo WILD's Critter Fixers: Country Vets recommend the Duraforcec Bone Squeaker ($10) because of the material. They said it's very easy to clean — you can even put it in the washing machine!
They also love Duraforce toys because they make super durable toys for heavier chewers. Bonus: these toys float, so if you have a pup that loves the water, they can take it in the pool or tub with them.