Why just polaris and dolphin?  I used a few years Tigershark... as for me good variant... 🍺 

Polaris 9550:

Pros:

• Excellent cleaning performance, particularly for larger pools like yours.
• Advanced navigation technology ensures thorough coverage and efficient cleaning.
• Equipped with a powerful vacuum and scrubbing brushes for comprehensive cleaning.
• User-friendly control panel with programmable cleaning cycles.
• Large filter can hold a significant amount of debris.

Cons:

• Higher initial cost compared to some other pool cleaners.
• Requires occasional maintenance, such as cleaning or replacing filters.

Dolphin CC:

Pros:

• Energy-efficient design, potentially resulting in lower operating costs over time.
• Intelligent navigation system ensures systematic coverage of the pool surface.
• Effective cleaning performance on various pool surfaces, including tile, vinyl, and fiberglass.
• Easy-to-clean filter system with simple access and maintenance.
• Quiet operation suitable for use during any time of day without causing disturbance.

Cons:

• May struggle with larger debris compared to some other models.
• Some users report occasional durability issues over long-term use.

Considering the size of your pool (16x32), for effective cleaning, I would recommend the Polaris 9550 model; it will handle the task excellently. Additionally, you can consider the Polaris 9450 model; it will also be suitable for your pool. The only difference is that it lacks a remote control, but in terms of functionality, it is almost equivalent to the Polaris 9550 model.

Also you can check our comparison table here - https://intexpoolpumps.org/polaris-9350-vs-9450-vs-9550-vs-9650iq/#face-to-face-comparison-table

As for me Dolphin CC much better!!! My neighbour bought this model and happy 2 years))