Two answers to that question: 1) it depends and 2) still in search of the perfect needles.
I knit w/ circular needles even when I'm not knitting in the round. I don't like Clover bamboo mostly b/c the cord is way too stiff. I thought I loved the Crystal Palace bamboo b/c they are a very smooth surface, but I'm starting to decide I don't like the connector b/c it's not smooth enough and yarn gets caught slidding over it. For bamboo, I'm now leaning towards Addi Natura. I also like Addi Turbo's for sticky wools, but it took me awhile to decide that I liked them, but I've only been seriously knitting for 1 year.