Every comparison begins with the same field list. A field is populated only when the wording and date can be recorded without turning an unverified claim into an editorial fact.
Five comparison rules
1. Mars remains the benchmark
Every pair starts with Mars. The site does not expand into generic profiles or rankings, which protects the project’s narrow comparison purpose.
2. Both sides receive the same question
Fields, labels and uncertainty language remain symmetrical. Visual colour is used to distinguish columns, not to signal a winner.
3. Unknown stays unknown
Missing or conflicting information is marked “Not independently confirmed”. It is never silently converted into zero, false or a disadvantage.
4. Every observation is dated
The web changes quickly. A visible snapshot date tells readers when the comparison was last materially reviewed and avoids presenting old observations as current guarantees.
5. UK describes the audience
British English and UK-oriented explanations are used throughout. This does not establish that either compared service offers UK delivery, UK vendors or domestic availability.
Corrections
Material corrections should identify the page, field and a public source. Do not submit credentials, private communications, personal data or operational access information. See the corrections page.