Have you gotten your food intake in order? How much weight have you lost?
If you're in a caloric deficit you'll continue to lose fat with either workout. I would say go SI just so you don't get bored.
Remember, the key is to keep your diet in order and keep working out. However you need to stay motivated is what you need to do.
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"Only those who will risk going too far can possibly find out how far one can go." -- T.S. Eliot
"We are what we repeatedly do. Excellence, therefore, is not an act, but a habit."-- Aristotle
"Losers make excuses, winners make it happen!"
http://www.thepensiveprogrammer.com/
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