We have a 105 with a starphire front. The difference is quite obvious between the two types when you look at the tank with water in it. The Starphire is much clearer. We haven't noticed it being any easier to scratch than regular glass, and as for strength, well, it keeps all the water in the tank, so it's strong enough.
For the clarity, I'd go with Starphire any day. Of course, we got a sweet deal on our tank, so, that helped make our decision.