Hi Saurabh,
I am on H4 Visa as of now and in talks with one consultancy based out of US who is ready to file my H1 Visa this year only if i provide them with a client letter or a sponsorship letter. In that case i have two options :
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One option is i can ask my Indian company to give me the client letter as they have registered office in US but as of now only couple of employees are there. 
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I have another company based out of US who is ready to provide me the client letter needed to file H1 visa. 
Now the questions are:
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Which option should i choose? 
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What are the risks involved if i go with my present Indian employer as they are not fully operational in US . Will this affect my petition also. 
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What kind of reference check USCIS will perform if i opt for indian company? 
4.Can i opt for premium processing?
Waiting for your reply.
Thanks,
Varun