The first one is correct. "It is like" the best decision you can ever make.
Saying it that way, is the same as saying that it would be the best decision that you can ever make, but adding more to it. Almost as if soeaking to someone who is overdramatic, and constantly say the word like.
I hope this helps
Explanation:
our planes can protect the air force by shoot down the enemy planes
Answer:
The group does not sing in all eleven languages spoken in South Africa.
Explanation:
Their singing would be a positive, and if they aren't willing to, it would be a negative or, to put it another way, a bad thing.