I've just grown 4 sensi stars. I had 2 different phenos, a short, lemonny indica dom and a slightly taller, more skunky type. Both were as strong as hell, but I preferred the skunky one - each to their own.

I have seen mention of a sensi star 'Ogre' pheno but I don't know if it's true...
E2a: The yield from the 2 different phenos was pretty much the same for me. I think my 2 skunky ones gave me slightly more than the short ones but there was nothing in it.