Visitor Visa - B2

I am 38 years old male, married, have my own home and other property applied for USA B2 tourism visa along with my cousinn 33 male married with same status.

We both worked 10 years in our family business as MD and CEO respectively. In August 2015, we formed a new company as partners and sucessfully countinued its operations.
We still have our family business as well.

We filled the form with each and everything same except personal data. We did not have any contact adress in USA. so we wrote hotel adress for this. Our annual income is 1.8 million p a.
On interview day, we reached there at 8 am as time was 9:30. A long que was there. I was asked to take counter no. 3. A young guy was there.
Vo: how r you
Me: fine and you?

Vo : fine.
Me: pas him my pasport

Vo: so why r you going USA?
Me: for tourism

Vo: where in USA?
Me: Newyork

Vo: have you travelled any country ?
Me: yes. Thailand (4 times), Malaysia (4 times), UAE (2 times), KSA (4 times).

(Total 3 questions)

Vo: okkkkk and start typing
After 1 minute he said sorry i cant give you visa.

Me: thank you and came out.

After 5 minutes, my cousin came out with visa approval. He was asked to take counter 4.

Amazing. Same aplication same status. Same business. Same salary and incone. Same form filling but diferent result ---------?

Can any one explain the reason for my rejection? And his acceptance.

Now i want to re apply as we both want to travel combine. What should i do ?
Any suggestion ?