What's makes a good omega verse?

I'm planning on writing a BL book with omegaverse theme. I want to ask what's makes omegaverse good?
Exclude things like Male omega can get pregnant, But pheromones thingy, fated mate or biting one's neck to be mates is good? Or cliche and boring?
Whats your favorite omegaverse BL? (Alpha x Alpha enjoyer, sorry to burst your bubble but I'm looking for Alpha x omega)