octopus has more reliable (and updated pinwheeled) OTP-1000, AquaEuro has the same old unreliable resun needle wheel its always had. octopus has the updated semi cone transition, PS-55 still using the funnel neck (that octopus used on their previous NW line).
BTW the Aqua euro is just the older discontinued Octopus PS/TS-120 with resun pumps instead of octopus pumps. I think they pushed them off on aqua euro when they discontinued them.
discontinued octopus TS-120
latest aquaeuro PS55
and naturally the previous line of Octopus NW skimmers were just funnel neck AquaEuro skimmers with octopus pumps. aquaeuro and octopus are made in the same factory. pumps and updates are the only real difference between the two but octopus have more reliable (and updated pinwheeled) pumps.