Yoga mats are just paraphernalia, like the paraphernalia that some starters in magic practice think they will need, the equipment doesn't make them any better, and a yoga mat will not make you any better at yoga. Don't waste your money, any type of mat or rug of the right size will do, an old off cut will do the job.
I was in the market for a mat that wouldn't get slippery during warm yoga. I went with a Jade mat because it is made of rubber and it is absorbent. If I need extra traction, I lay a towel under my hands or feet, and there is zero slippage.