Thank you very much. I have now found "data sheets" on the Internet and can list the following differences.
SpotClean Pro (171.-) - Scope of delivery:
- 8cm Tough Stain brush (red)
- Spraying Crevice Tool
- HydroRinse Tool (Self Cleaning Tool)
- Wash & Protect Pro (236ml)
- Oxygen Boos (236ml)
SpotClean Pet Pro Plus (282.-) - Scope of delivery:
- 8cm Tough Stain brush (green)
- Stain Trapper Tool
- HydroRinse Tool (Self Cleaning Tool)
- Wash & Protect Pet
SpotClean Auto Pro Select (235.-) - Scope of delivery:
- 15cm Large Stain & Upholystery Tool
- XL Sliding Crevice Tool
- Spot & Stain Pro Oxy
Conclusion: If you can believe these data sheets, the extra charge is not worth it. The technical features do not differ, only the scope of delivery. I will now buy the entry-level version and probably 1-2 other attachments.

Hello Kevin. My statements are without guarantee ... I have the Spot Clean Professional and am completely thrilled. My car seats in particular were perfectly clean again. A friend also got the upholstered headboard of her bed clean again. The prices are probably so different simply because of the different accessories and of course different suppliers can also be to blame. However, the standard accessories on my device are perfectly adequate. As you write yourself, the technical features (e.g. motor power) are the same. You can therefore simply order from the cheapest supplier. Good luck! Peter