In theory, the border measurements should be in proprtion to the blocks. EG if you have a 9 inch block, a border should measure 3-4½ inches wide. This is not a hard and fast rule, but it helps.
From what I can see, in the first picture the dark blue outer border is too wide, and in the second picture it is too narrow. Try laying it out so that the inner blue border width, plus the pieced border width, plus the outer blue border width adds up to the width of the zigzag. That might be about right.
If a border is too skimpy, it looks as if you shouldn't have bothered; if it's too wide, it swamps the centre. In the end, though, it will be the size you like best, and that will be the right size.