Whichever you choose, double points or circulars, there's one thing that a beginner should know. Every time you switch from one needle to the other, be sure the yarn is positioned BETWEEN the two needles or coming from the inside of the tube. This will prevent you from getting an unwanted yarn over. I couldn't for the life of me understand why I was always getting an extra stitch at the end. I was positioning the yarn behind the back needle instead of from the inside. There are tons of Youtube and other instructional videos out there on knitting in the round, but not one of them shows you that. I had to figure it out for myself.
Welsh corgis are cool.