Why is the Dragonfly better than the Mouse? First of all, I've never handled a Mouse, have just seen pictures, that's all I have to go by, I'm making some edumacated guesses.
So, within that context: (1) Blade grind: Dragonfly is full flat grind vs. Mouse's sabre/hollow grind. In this type of knife, full flat grind is better than sabre/hollow grind. Dragonfly wins.
(2) Blade pattern: Both have a nice edge shape to them, but Dragonfly's spine is a smooth, gentle curve from tip to handle, while Mouse's spine follows a somewhat not-so-gentle curve from tip to handle (look at pictures). Mouse's spine suddenly bulges out at the thumbhole with a rather ungainly hump, a feature found on some other Spyderco's as well. Dragonfly blade pattern allows for better straight-on penetration than does Mouse. Dragonfly wins.
Those are the two main points. Other points are rather minor to me.
VG-10 vs. Ats-55: does it really matter that much? Or at all? (No).
Handle shape: Both seem pretty good to me. I really like the way Dragonfly fits in my hand. I bet that Mouse has good ergonomics as well.
Solid: How is Mouse more solid? Dragonfly is SS, Mouse is aluminum - so how is Mouse more solid than Dragonfly? How can Mouse be more solid than Dragonfly? It doesn't make sense to me that Mouse is appreciably more solid than Mouse. Wishfull thinking?
Price: Dragonfly is around half the price of Mouse. But price aside I prefer Dragonfly over Mouse, although I'm sure the Mouse is a very nice knife as well. Just not quite as good as the Dragonfly.
But like I said, I've never handled a Mouse, I've just seen pictures, so I could be wrong, though not likely
