My personal preference is for the traditional cabinet scrapers with a proper burr edge, as opposed to the 45 degree knife edge scrapers. I used card style scrapers for a while, but Keenan Howard turned me on to the longer, narrow scrapers (shaped like a big Popsicle stick). I just made one for myself out of an old combination square. These are pretty common at garage sales and flea markets. It took some time on a rough stone to grind through the stamped numbers, but it was worth it. I is a thicker steel than traditional card scrapers but still flexes nicely.