Hyperbolic Time Chamber and king kai's planet both have x10 gravity king kai's planet however can get you weights and skills such as the kaioken and the spirt bomb other than that however they are identical when it comes to training

king kai's planet is reached by walking all of snake way which is around 3000 blocks and the hyperbolic time chamber is reached by going to the building in kami's look out and walking through the brown door blocks