Ollie's quite long for a boy, males should be fairly short backed and only just slightly off-square so a teeny bit longer than tall. He has the better head of the two. He toes out a bit when he stands.
Pippin's got the better proportions but her head lacks a bit, she looks young and it may develop some, but the stop's not as sharp as it should be.
We can't really see either of them standing or stacked from the side, so its hard to comment on topline at all but that is really important.