I really like the official Apple leather case, has a lot more grip than I thought it would - more grip than any Incase, Casemate and Incipio case I've ever had.
It has textured sides so you can easily grip the phone and it's not as bulky or slippery as the Spigen Neo Hybrid. I do find it interesting that the Neo Hybrid in red has a much glossier and slippery plastic on the sides than the gunmetal.