I have to say this before I begin: I highly suggest you try on both to make sure they fit and I boots are all made differently, in fact you've pick quite possibly the two most different boots. Full Tilts are very narrow and Salomon boots are very wide comparatively. Now, if you're set on these two, and you seem to have a problem with shin bang then I think you already know which one you want. Full Tilts are awesome IF they fit, it not then you're in for a world of pain, however the same holds true for Salomon boots. I have the booters and they are super light and very fun to ski in, but they fit my feet properly.
Also, Shin Bang has NOTHING to do with the type of boot you get, yes some boots can REDUCE shin bang (the booters especially because they have a very soft flex and the collar in the back of the boot is cut low), but it will not eliminate it. It's a common misunderstanding that you get shin bang by smashing your shins into the front of you boot (so people think that getting a soft tongued full tilt will help this) however, shin bang is actually caused by bend BACK your lower leg - so landing back seat and leaning back a lot will cause shin bang. That being said I have NEVER had shin bang with my full tilts - BUT I don't land backseat anymore either...does have that have to do with my boots or my skill - you decide.
SPARKNOTES: (if you're set on these two and don't want/can't try them on....) GET FULL TILTS!