Just going to echo The Professor's sentiments here. I'd also like to raise a concern I have about some of the designs, in particular 2's: The four black horses both make an otherwise straightforward design harder to create and (personally) detract from the dragon motif by hogging precious space.
That aside, 2, and 4 seem marginally easier to make than 1 and 5, which entails creating coats of arms wih unique elements and symbols from scratch. 3's relatively simple in comparison to tracing a three-headed eagle or a golden dragon, though the color scheme may clash with the rest of the "tetra-"color.