As a relative newbie to 3D printing, I've had my printer running for a little over 2 months now, I thought I'd see how big of an anthill I can kick over by asking which slicing program the rest of you are using.
I'm using the latest stable version of Slic3r and I like it, though it still gives me a severe beating occasionally. While I was waiting for my 1st printer to be delivered, long story - suffice it to say Ebay agreed with me that I was getting screwed and refunded my money, I had time to play with both Cura and Slic3r by running print simulations of many 3D objects through both programs to compare them. There's a number of places to download 3D models that won't cost you any ducets. One thing that I did notice was that Cura would sometimes - not always - miss the required support and try to start printing an object in mid-air, Slic3r didn't seem to have that problem. That's my reason for choosing Slic3r, what are you running and why?