Culture is a 100+ year old technology that is limited to identifying only what will grow in culture. Given that many microorganisms will not grow in culture, this technology is dramatically limited in the number of microorganisms that can be identified. Culture creates bias because just one bacterial cell can grow and render a sample positive for that bacteria, irrespective of if that bacteria is causing an active infection. Additionally, culture does not allow for consistent, objective identification of microorganisms to the species level.
Not all NGS techniques are the same though, there are multiple different forms. Some, used by our competitors only look at bacteria and have difficulty looking at the species and strain level. The type of NGS we use, called shotgun metagenomic sequencing, is one of the most powerful among NGS techniques able to do it all.
Shotgun metagenomics is more specific than culture can be because it identifies the identity of microorganisms according to the genetic sequence and not simply appearance of growth in culture.