Final character pondering: dark/dark possibilities

My first level 50 was a dark/dark defender, years back on an account for which I lost the access info and couldn't pry it out of customer service. In the time remaining to us, I figure I have the time to run up 1 or possibly 2 new characters to 50, incorporating what I've learned over the years and giving it all a final touch. Today it became clear to me that if I can only do one, I'd like it to be dark/dark.

What I'd like is folks' thoughts about a good archetype for it. I'd like to be able to solo well, including if at all possible some GM/AV fighting, and to be a good teammate. Back in the day (when CoV was brand new), defenders tended not to be good soloers, but these days they can do fine. How much difference would I notice going for a corruptor, though? Obviously weaker support and more personal oomph, but how much at (say) 20, 40, and 50?

Also, I love controllers, but they do tend to mature really slowly relative to a bunch of other types. How does dark/dark do along the way, and at 50? (Yes, I know it's also an option for dominators, but I don't like the Domination mechanic. Just not so fun for me, so I leave it for others to have that much of it.)

Thanks kindly.

My dark/elec defender was the first defender I got to 50. I think a dark/dark could solo fine once you got high enough to have a decent attack chain, but I really don't know about GM/AV fights.

I have a dark/dark Controller and it seems light on the damage. Loads of control, though.

I haven't done much with Corrs or Doms... which I'll have to rectify while I still have the chance!