It's tough to find info on meter accuracy because most companies just test how often their meters meet the FDA guidelines of being +/- 20%. Shockingly enough, many glucose monitors can't even meet this guideline consistently. I've read Bayer Contour is the worst, but can't remember where I got that from.
One Touch have always provided the highest level of accuracy for me. I contacted their customer service dept. last month when my insurance company said they wouldn't cover One Touch strips anymore. See the response below. The Freckman study may help you find what is statistically the better meter of the ones you're trying.
Thank you for taking the time to write to us. We are sorry to learn of your recent experience. We shared your inquiry with one of our managers for Global Product Support, who provided the following information:
"LifeScan’s meters meet FDA standards and, to our knowledge, no manufacturer of glucose meters claims accuracy greater than the FDA standard for its meters in the United States. FDA’s standard for glucose meters is the International Organization for Standardization (ISO) requirement of 95% of results within ± 20% for glucose values >75 mg/dL and ± 15 mg/dL for glucose values <75 mg/dL.
In an independent clinical study, the OneTouch UltraEasy meter (the trade name for UltraMini™ in Europe) was shown to exceed the ISO 15197 requirements with 99% of the data within ±20% of the reference (Reference: Freckmann). In this study, more than 40% of the blood glucose monitoring systems tested did not meet the minimum accuracy requirements of ISO 15197.
• One Touch Ultra System Accuracy (2001-2009) 11/09 LifeScan publication AW 3037331A
• Freckmann G et al. System Accuracy Evaluation of 27 Blood Glucose Monitoring Systems According to DIN EN ISO 15197. Diabetes Tech & Thera 2010;12(3):221-231."