235/60 R18?
I see..those Westlake and Maxxi tires are decent, mid-level tyres.
Dunlop and Michelin are some of the highest rated tires you can buy, thus the high price. Michelin's are very durable and long lasting. Dunlops have softer rubber, very good performance, such as traction and braking.
The Dunlops would certainly be better but the Westlake's and Maxxi's will be fine if you're on a budget.