They basically mean alsmot the same, but when to use could vary. I would not say there are noticeable differences between those words, whereas you will get used to using it by reading at different ways of use. 선택 and 택 can be used to express same sentence. For instance.. 도망갈바에는 싸움을 택하겠어 도망갈바에는 싸움을 선택하겠어 - both of them could express the same meaning. In contrast, if you try to say with 고르다, it may sound a bit awkward. As the other person already mentioned, they are more often used in a situation selecting something within small choices. It is ,however, not necessarily alwaus right. Here i will give you some examples, 이중에 무엇을 선택할래요? 이중에 무엇을 택할래요? 이중에 무엇을 고르실래요? - What would you choose among those? All of them sounds very natural. Furthermore, 선택 is generally used as a noun. If you like wathcing korean dramas or films you may have heard of it sometimes. 그것은 너의 선택에 달려있어- That is up to your choice What it can also means is that " That will depend on your decision. Accordingly, i guess you can understand that this could imply decision. These are all i can help you with. I am sorry if it confuses you more haha.. 한국어 공부 열심히 사셔서 보기 좋습니다^^ 화이팅

선택 (選擇)하다 or 택(擇) 하다 comes from 한자어(chinese word?!) 고르다 is native korean verb. 고르다 - I think I don't use this for person. normally use for things. 선택하다 is more used than 택하다. 선택하다 is more like selecting better one between two or more rationally. I think 택하다 is more like prefer(or pick) something?! there is lack of reason for selecting. I found a nice explanation http://koreanselfstudyisntlame.blogspot.kr/2010/08/vs.html