First question: which SDK do you use in your IDE (Android Studio?). If it is not specified in the settings of Android Studio, it may be in the system variable (try echo $ANDROID_HOME from the terminal)
I assume that you are using android-sdk-mac_x86 and you should save it. it looks like the last official standalone SDK, as written on the developer's website :
Unzip the downloaded zip file. By default, it is unpacked into a directory named android-sdk-mac_x86 . Move it to the appropriate location on your computer, for example, the Development directory in your home directory.
Write down the name and location of the SDK directory on your system - you will need to access the SDK directory later using the SDK tools from the command line.
The folders you mentioned also match the ones that come with this SDK.
If you are still not sure, you can rename one of them and see if there are still ticks.
I would personally delete both and start with a new SDK that matches your current SDKs, we usually carry garbage from the past that we really don't need ( http://developer.android.com/sdk/installing/adding-packages.html )