I have both the 150mm Sonnar and the 180mm Sonnar. The 180 has to be one of the best Hasselblad lenses ever made, it really is something special optically. However, as others have mentioned, it is front heavy and awkward for hand-held use, if that's what you're looking to do with your gear.
If you already have the 150, I'm not sure what the 160 would gain you. You lose a half stop of maximum aperture, you lose the Sonnar look, and you only gain a truly insignificant 10mm. If you don't have either yet, I can see why you're debating it; although I haven't compared prices, I can't imagine the 160 being significantly cheaper than the 150, which is one of Hasselblad's least expensive lenses, if not generally the cheapest. And it's a damn good lens.
It is nice that the 160 comes in the CFi configuration--my 120 Makro-Planar and my 180 Sonnar are both CFi lenses, and I do like that better than the CF and far better than the C versions, for ergonomics. (The 150 CF has a particular problem in that the plastic trim ring behind the focusing grip breaks frequently, which is a real pain--the rubber focus grip slides backwards in use when that happens. I got my 150 CF with the broken trim ring so it was quite cheap indeed, and was able to get a 3D-printed replacement made that has served me well for over a decade.)
If it were me, and I had neither lens yet, I'd probably go with the 150 because it's faster, optically it's probably at least a bit better than the Tessar, and there's a bigger gap between it and a 180mm lens in the event you do indeed decide to get one of them as well one day--having both a 150 and a 180 seems to make a bit more sense than having a 160 and a 180, and I find I do have different use cases for my 150 and 180. If I already had the 150, I really don't think I could make the case to justify the extra expense of the 160--which it sounds like you're not really wanting anyway and you have your eyes on the 180--and I'd just save my money to put toward the 180, which is indeed a truly outstanding lens.