There is significant enough differences, given that Angular2 is a rethink and rewrite, that support the idea that if you're just starting out you're not hindered by the "That's not how we did it before" thinking that coming from Angular1 will raise for many. An advantage as such... of course many developers are used to wiping the slate clean and ramping-up again with a new product version, in which case experience is an advantage.
In short, I've not seen any compelling enough evidence to suggest that if you are starting out Angular1 should be chosen over Angular2. While it's still in RC it's a good time to get ahead of the crowd also.