The ease of use, the GUI, the speed of the miner, the fact that it's open source and it's free. There are some bugs here and there but nothing really serious. I've been using this for several years now and never had any problems at all. I recommend this to everyone who wants to mine cryptocurrencies. It's easy to install, it's easy to use, it's fast and it has a very good community behind it.
You can't go wrong with Awesome Miner. If you don't have a GPU, you'll need to invest in one…