At that time, the Roomba i4 and i3 were not available yet. However, I can provide you with some general information on how to compare these robotic vacuum models.
When comparing the Roomba i4 and i3, it's essential to look at their features, specifications, and customer reviews. Here are some factors to consider:
Suction power: Check the specifications for the suction power of each model. The higher the suction power, the more effective the vacuum will be at picking up dirt and debris from your floors.
Battery life: Consider the battery life and charging time of each model. Longer battery life allows the robot to clean larger areas before needing to return to the dock for recharging.
Smart navigation: Look for features like iRobot's iAdapt navigation technology, which allows the robot to efficiently navigate and clean your home without missing spots or repeatedly going over the same area.
Dirt detection: Some Roomba models have dirt detection sensors that can identify high-traffic areas and concentrate on cleaning those areas more thoroughly.
Bin capacity: Compare the dustbin capacities of both models to see which one will require less frequent emptying.
Additional features: Check for any additional features like app connectivity, voice control (e.g., with Alexa or Google Assistant), virtual walls, or mapping capabilities.
Price: Consider your budget and compare the prices of the two models to see which one offers the best value for money based on your specific needs.
Customer reviews: Look for reviews from customers who have used these models to understand their experiences and satisfaction with the product.
Ultimately, the "best" Roomba for you will depend on your individual preferences, cleaning needs, and budget. I recommend checking the latest reviews and product comparisons for the Roomba i4 and i3 to make an informed decision based on the most up-to-date information available.