I'd say Ableton lite is still a step up, and gives you familiarity with the Ableton interface, which means you are primed for using one of the bigger editions. However, if said 16-year-old does not currently have a midi keyboard / controller I would look at buying one that includes bundled Ableton Lite as the gift. Something from the Novation Launchkey range would fit the bill.

Ableton suite is amazing because of all the content you get with it (instruments, effects, samples), but lite comes with enough to get you going and you can always add vsts and samples from 3rd parties.