Jeelib for arduino (an advantage of LowPower lib)?

it is not a long time, I was sereaching for some library to save power of my arduino M0, I have found this: GitHub - rocketscream/Low-Power: Low Power Library for Arduino But, recently one friend of mine told me about jeelib, I exactly do not know what is it or what should it do. Here is URL: JeeLib: Introduction And here is github URL of the same library: jeelib/test2.ino at master · jeelabs/jeelib · GitHub

Do you guys have some experiences with this library? Is it better than LowPower?