The Roomba and Shark are both solid robovacs, so the answer to this question is ultimately subjective. When it comes to price, the Shark is going to save you a few more dollars without having to sacrifice too many fancy features. Both brands are great at navigation skills and mapping capabilities. The suction power may vary depending on the specific model — some Shark models have better suction than other Roombas, such as the Shark Ion 850. But while the Shark wins the budget category, the Roomba’s tried-and-tested features kind of make it worth the money. Its self-emptying feature outperforms that of the Shark’s, and its mapping capabilities are likewise advanced.