EB4 S3's are the same price as the Hyper 8's (shop around). Both buggies are excellent.
Mugens are also very good and have some more quality in the parts but IMO they are not worth the price they sell for, their diffs leak as well.

Kyoshos are great but again they are overpriced. Just avoid their RTR buggies. My Inferno is 13 years old and still going strong with mainly original parts.

At the end of the day the buggy makes about 10% difference, the driver makes the rest, a Hyper 7 TQ can beat a buggy 3 times the price with the right setup and skill.