In both situations, both options you've provided are grammatically correct. The one that feels most natural to you and you find most comfortable is always going to be the best. However, in both scenarios, my preference is for the second option as it is more direct and less likely to cause confusion for the person you're talking to.

For communication purposes, it is always best to use the active voice instead of the passive voice. Instead of the action described as being done to someone, it is clearer to describe the subject doing the action. For example, it is better to say "Which is the best dish in the menu?" (active voice) than "Which in the menu is the best dish?" (passive voice), although both sentences are grammatically correct. For the second set of sentences, the second one is better.

Both sentences are grammatically correct. The difference is that the first sentences are expressed in a roundabout way while the second sentences used the word 'best' as a direct adjective. Feel free to correct me if I'm wrong😇