I like the 2nd picture of each cat.
The 2nd of Minnosh is absolutely gorgeous, a great view of her tail as it is held slightly off the ground you get the full volume of fur there, her whiskers are visible (maybe I like that one because I have a preference for photos that really show the whiskers?) and held forward matching her alert expression. I also really like photos where the head is tilted at that angle, it is just my personal preference, but it's a pose I find very attractive.
The 2nd of Niles, because although the first is a nice enough pose, it seems to have a little bit of light reflection from the paler hair on his chest, it bleaches the photo just slightly - I have the exact same problems wth photos of my blue and lilac OSHs, if the direction of light isn't absolutely perfect their coat reflects it. The lighting in #2 is better IMO, you can see the paler colour and there's no ethereal glow
It could of course be that my monitor doesn't display it correctly! I also prefer the facial expression in #2 though, and I prefer a full body photo to just the head. #1 is maybe looking too straight-on in relation to the camera lens and also to a point slightly above it, that is just my taste though as I think it gives a slightly 'manic' look, I prefer if their gaze is directed at a point a bit further to either side which gives an alert but slightly less intense facial expression.
ETA: I am in love with Minnosh she has the most beautiful distribution of red and black in her coat - very pretty colouring