Are all shoe trees the same or are the brand name ones better quality?
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If the material is the same then there should be little difference between brand name shoe trees unless they are a specifically shaped last for a specific shoe, i.e. when you buy bespoke shoes it is common place to recieve a pair of shoe trees specifically for those shoes as they will keep the shoe as close to its original and intended shape.
TIP: cedar shoe trees are the best for many reasons but bespoke shoe trees are often made from a range more luxurious woods for aesthetic purposes.
If you call Allen Edmonds (or this may even be online) - they have a "cheat sheet" that lists every width/size and what size shoe tree goes with it. I have 2 pairs of AE shoes and both have AE shoe trees in them - I like them a lot.