I think I'd vote for the Cybex then, as you'll be in the awkward stage with the Maxi Cosi insert for ages.
I agree that both of these are better than the Cosatto.
With the Cybex, you have to push it up to spin it, which is OK when you have a teeny 14lb baby but think about when you have a 14 kilo toddler - it does get a bit more unwieldy. But not necessarily a dealbreaker. They are nice seats to use.
I have to be honest I don't think there's anything about the Axkid Spinkid that makes it worth the price. Besafe have a spin seat for a similar price, also plus tested, which is worth looking at because it accommodates sloping vehicle seats, which most isofix car seats won't do very well. However, you don't necessarily need that unless you have a very angled rear seat in your car.
As others have said, if you think you'll want a longer rear facing seat long term, it can be worth the investment to start out with one from the beginning e.g. Axkid Minikid 3 (or 4), Avionaut Sky, Besafe Stretch. However, these seats do not have the spinning feature. All the spinning seats max out at 105cm which is approx 4 - 4.5 years for an average sized child.