Hi Leonie
I also have the Spot Clean Professional and I'm very happy with it, even though I only have one cat and not two dogs like romainburquier.
Technically they are identical apart from the design and cable length.
I can't tell you what you get for the nine francs difference in price.
Greetings
Patrick

I've never tried the other, but I have 2 dogs who are often in the garden, in the forest and then on the sofa, and that's good enough.