I would guess the more expensive ones are the most accurate, I use Sure which unfortunately are the most expensive, was kind of stuck with this as nurse gave me a Sure meter on diagnosis So just carried on buying the strips, although I can get them cheaper on line and on eBay sometimes. They are dead reliable and the company has full telephone support sending you free stuff if you break anything plus it links with their excellent app. Don’t use them so much now in order to cut costs and I am clued up with what I can and can’t eat. This said it’s the patterns and spikes which any meter will give you that is important rather than the absolute numerical value as most will give you different readings within a range depending on which finger you prick even if done immediately one after another!