The difference between lo mein and chow mein noodles is that low mein noodles are often fresh and thick and chow mein noodles are also sometimes fresh and are dried and thinner.
Chow mein noodles are stir fried noodles and lo mein noodles are tossed with other ingredients.
The main difference between low mein and chow mein noodles is in how the noodles are prepared.
Lo mein noodles are also often saucier and more toothsome and have a texture that is often described as being slippery because the noodles are soft.
Chow mein noodles on the other hand tend to have a greater variety of textures within the dish, due to the added texture that results from frying the noodles.
Lo mein noodles are somewhat healthier than chow mein although they're not that nutritious.
Low mein noodles can be cooked with veggies, meat and tofu for a better meal and are often healthier than chow mein because they're not fried like chow mein.