Hi
@finsit
You need to take into account compatibility with the glucose meter you're using.
The Contour Next strips are compatible with any Countour meter with 'Next' in the product name. Contour Next ONE, Countour Next USB, Contour Next etc. (and the Contour XT)
The Contour Plus strips are compatible with Contour® Plus Blue and the Contour® Plus. The Contour Plus strips will not work with a Contour Next glucose meter - according to the manufacturer anyway.