Eh, who the hell told you that?
Anyway, I've seen your designs, and here are my thoughts on them. Keep in mind that I'm probably being overly critical
The Dagger looks great, it looks like sort of a mix between the Arrow and Stiletto. There are some things I didn't like, though:
-The cockpit is waaaay to big. I would make it about half of its current size... you know that black stripe around the nose? That's where the back end of the cockpit should be, in my opinion... maybe you could stretch it a little more to the back, but right now it's definitely too big.
-The wingtips (the black and blue areas) look "bent" upwards like a smooth curve... I think they would look better if they were "folded" updwards, more like an "L" (think of the Hellcat's wingtips, but upside-down). Other than these points, I really like this design.
Now for the Snipe... Its cockpit also should be smaller, specially since medium fighters are usually big. Also, the ship should be more bulky... notice how all WC fighters, apart from the Ferret, Arrow, and Piranha, have a pretty big hull, with engine intakes, and large bellies...
You should try adding some more detail to the body of the ship, like some extra intakes, some detail to the wings, or something else that made the ship look more bulky than simply a cylinder with square wings.
By the way, I like the idea of an engine intake under the cockpit, like the British WW2 Typhoon fighters... but I've tried dozens of times, and never managed to design a space ship that used this idea well... and I think this is the problem with the Snipe: having a central intake right on the nose of the ship limitates the shape of the body; there's not much you can do to make the ship look bigger and bulkier without having to change the way that intake looks.
Hope that helps,
--Eder