Cool. The more the merrier 
LDraw has a much broader range of parts and, minifig accessories aside, is likely to maintain this lead. Mainly because LDraw has the goal of including every part, including those that are no longer produced, while LDD focuses on the current pallette in production.
We may fall behind on minifig parts as TLG seem to have ramped up new moulds for these (cheaper production = more range quickly) and they tend to be a bit complicated. But with new part editing software coming online and the potential for texture mapping in the near future we might even be able to keep up with this.
For editing... it depends what you like. LDD restricts building to what they consider to be 'legitimate connections' so there are things you can do in real bricks and in LDraw that you can't do in LDD.
Tim
LDraw has a much broader range of parts and, minifig accessories aside, is likely to maintain this lead. Mainly because LDraw has the goal of including every part, including those that are no longer produced, while LDD focuses on the current pallette in production.
We may fall behind on minifig parts as TLG seem to have ramped up new moulds for these (cheaper production = more range quickly) and they tend to be a bit complicated. But with new part editing software coming online and the potential for texture mapping in the near future we might even be able to keep up with this.
For editing... it depends what you like. LDD restricts building to what they consider to be 'legitimate connections' so there are things you can do in real bricks and in LDraw that you can't do in LDD.
Tim