Hey,
First off,be sure of your calling. Do you really want to ace Civil Service Examination or it's just that you are calculating the benefits of being one. See, Civil Services is not a cakewalk. You need to respect this profession. Both IAS and IFS are equally important and respectable posts and cannot be compared. They are the arms of the All India Services along with Indian Police Service(IPS). If you ace Civil Service examinations and become the IAS/IPS/IFS officer,you will enjoy a special status in the society. Plus,the payscale is quite high and along with it you will be given various incentives. Now coming to your question about which stream to choose for cracking UPSC,let me make it very clear that there is no specefic stream for it. The syllsbus is common for all. So,irrespective of your stream,you can crack UPSC with your hardwork  and perseverance.
Hope this helps you.
Good luck.

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