Blind, the concealer shades are identical, it all depends on whether you want to counteract redness (with the green) or yellow/sallowness with the purple.
I say go with 1
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Nursee, its hard to tell without seeing a picture but considering you fall in the medium color range I would say 3 is a safe bet
Keep in mind, there are 3 shades to mix to make the perfect color for you. I would just make sure the middle shade is as close a match to you as possible. This assures you won't go too dark or too light with the matching shades.
The other great thing about this palette is that you can use it year round since you can mix up the colors regardless of whether you get a little darker or a little lighter