Small thing for those who are interested: Nami starts with 400 hp and gain 4 per point as well as 18 attack with 2 per point. The Ent Queen has 20000 hp and gets 50 per point, her attack is 70 with 4 per point. She can no longer get speed points and is stuck at 0 speed.
Verdict: Nami kinda suck for how late you get her, she can wield a bow but she can only point blank with it and her 400 hp doesn't really want her doing that. The Queen is the premier base defender, she has a ranged attack that leaves a damage field and tons of hp. Giant and the Queen can probably deal with any non-totem raids.