Whole Genome Sequencing vs 23andMe: Data Depth, Raw Files, and Use Cases

Choose based on the question and the underlying assay

A SNP-array result can be a sensible starting point for ancestry and selected traits, especially when cost and familiarity matter. WGS is more appropriate when the goal is broad variant coverage, a reusable VCF-based workflow, or future analyses that depend on genome-wide data. Neither format turns a wellness tool into clinical care.

Compare the data you can export

Write down what you want to do after the test. If you want a general consumer report, an array may be sufficient. If you want to preserve a rich data asset for future interpretation, ask WGS providers explicitly about VCF access, coverage, build, and export policy.

Do not compare a vendor's total number of reports as though it measures data quality. Compare the underlying test type, data access, stated limitations, and whether the provider serves your location.

A practical comparison by use case

An array can suit someone who wants a familiar ancestry product, selected traits, and a lower entry price. WGS can suit someone who values broad reusable data, future re-analysis, or a VCF-based workflow. Clinical testing suits a defined medical question that needs validated interpretation and follow-up.

Coverage language can be confusing. Array vendors may report the number of positions genotyped. Sequencing vendors may report average read depth. These figures describe different methods and cannot be compared as a single quality score.

Questions that reveal the real product

Ask which variants the report covers, which raw file can be downloaded, how long the download remains available, and whether future reports require a subscription. For WGS, add coverage, assembly, variant types, and included file formats.

Plan for interpretation before ordering. Ancestry exploration, wellness education, and medical decision-making require different expertise. The clearest route starts with the intended decision and selects the test designed to support it.

• Selected consumer report: consider an established genotyping product
• Broad reusable dataset: compare WGS providers and raw-file policies
• Defined medical concern: speak with a qualified clinician or genetic counselor

Use-case checklist before choosing

• Write the question you want the test to help answer
• Decide whether raw-data ownership matters
• Compare total cost and recurring fees
• Review privacy, sample storage, research consent, and deletion
• Choose a follow-up path for unexpected or significant findings

Support both routes in one product

WellNizz's genetics catalog distinguishes WGS, exome, and SNP-array providers. Its analysis surface can receive supported WGS VCF or VCF.GZ files and SNP-array raw data, so products can begin with the data a person already owns.

Confirm important results through the right care pathway

Neither consumer SNP arrays nor WGS wellness reports should be used to diagnose or rule out disease. Significant findings require appropriate clinical confirmation and context.