I did both, but have kind moved forward with the Renegade Shepard that kept the collector ship. He also picked Morinth over Samara.
If it ends up being a dramatic game choice, I have a saved Paragon Shepard that destroyed the collector ship, picked Samara, and made many other Paragon choices, but I would need to go back finish this Shepard up for ME3.
I also was able to remain loyal to Liara, while romancing ALL of the other available ladies. So I also have saved Shepards with each of the romance options for his cabin. I think I like Kelly the best because her cabin entertainment is the most dynamic.
My only regret I did not get the Widow Sniper Rifle and my sniper damage is 4/5. However, the Reverent AR running 6/6 is about as deadly a primary weapon as you can have in the game. Especially with all of the various ammo types ready at the touch of a button.