请职场的牛人们帮忙，尤其老土和Easy.Spin

I will have a panel phone interview with 3 people for one hour in this Thursday. Please advice how to handle this kind of interview. Also, please help with the following interview questions. Thanks.

1)Why you left your former employer in one year?

It is mainly for my green card. My former employer would consider the green card sponsorship after working there for 3 years. By that time, I just started my career. I would say both companies (my former and current employers) are good companies to gain experience.

2)Why you want to leave your current employer. I have been with my current employer for almost 6 years. I just got my green card in August.

Would you please advice which answer is better? If you have a better answer, please share with me.

Option 1: I would like to share one statistics.
It is recommended changing jobs within the same industry three times during the first ten years of employment for a broader base of experience and an accelerated promotion cycle. You gain more experience from "three times 90 percent" than "one times 100 percent." Both reasons apply to my case. Also, my hu*****and and I work for the same company. It might be better off working for different companies.

Option 2: I am looking for an opportunity with upward advancement, salary, challenges, etc... You have an opening, and I want to see if you are a better fit for me than my current employer, in terms of upward advancement, salary, challenges, etc."

3)Describe the idea position and boss?

Idea position: satisfy my value, happy and smart people to work with, a knowledgeable boss with excellent leadership skill, great pay,
Idea boss: knowledgeable, know how to lead, coach, and mentor people, be happy to see his/her staff grow.

My question: how would you describer your value? How would you describer the idea position and boss?