scandium is the same as titanium.
No, it's not. It's a different element. Scandium is a group IIIB transition metal, titanium is a group IVB transition metal. The vertical columns on the periodic table are significant, in some ways more so than the rows. The element below or above any given element is likely to have more in common than ones to either side. While I'm not up on all of the properties of scandium, I'd expect them to be quite different from, and not interchangable with, titanium.
Also, "scandium" in this context (I think) refers to an alloy of aluminum and scandium. The Sc is added to the Al to improve the alloy's yeild strength, an area where aluminum pretty much sucks. The payoff is a large improvement in strength for a small weight penalty. Scandium is proportionally much stronger than aluminum than it is heavier. Like any materials decision, it's a compromise. If weight isn't an issue, you use steel, as not only is it very strong, but it's failure modes are "better." Steel tends to fail slowly, in that cracks and elongations proceed in a slow, linear manner, which is not true for most of the other common structural . When you switch over to exotic aluminum alloys, or titanium, it's almost always due to weight issues, or, for Ti, corrosion. Alloy choices, for aluminum, are almost always based on the need for additional strength.
Back on topic, while I will never buy one, I hope Smith sells a ton of 'em.
--Shannon