Hi Emoore
I do neither boxing nor TKD, so why am I posting?
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But let me add:
• as said before go to a class (there is a wide variety in TKD)
I think in terms of self defense TKD will offer more. For the 6' 220 pound male boxing has a lot to offer in terms of self defense (hands are generally faster than feet and in spite of what B.L. does, it is very hard to kick someone in the head "in real life" who has any fighting ability). Punches are much harder in boxing as well.
But for a woman who generally will be shorter and weaker than her attacker (I am 5'7" and 150 lbs) so short weak stuff is from experience, being grabbed and grappled in an attack is quite likely. A bigger stronger person with a longer reach can use boxing skill more easily to keep an attacker off than a shorter weaker person (relative to the attacker).
Very good defensive moves that work very well against stronger/bigger people:
eye strikes, groin kicks (it is not like punting a football), joint locks and reverses. and I think the biggie, is the head butt. This probably the most effective one. None of these are part of the boxing line up, and all except the head butt are probably routinely practiced in TKD (and I am sure you can get some head butt instruction as well).
BTW, the above poster, Chris Correia, is a master in TKD, and really knows what he is talking about.