HG is well regarded as the highest quality technographics in the industry. They are on the premium side of cost, but have now integrated into Clay
Regardless if you're looking for technographics to be 100% you will be disapointed, the data asset simply isn't that accurate, but it is directional. Try layering multiple technographics that paint a better picture of your ICP rather than just looking solely at 1.
What combination of technographics make sense for your ICP --> the more data points, the stronger directionally accurate it will be