The superlative 'best' is an extension of the term 'better', which compares values on some measurable dimension or dimensions. A community of experts has access to acumen, skills, tools, and methods for making such comparisons analytically; as such, their assessment of 'best' within their particular domain will be far more useful and accurate than the assessments of non-experts. In specific, expert programmers will have criteria for code — efficiency, simplicity, aesthetic qualities, etc — that only they can properly assess, so only they can make proper comparative evaluations.

The operative phrase, though, is 'within their particular domain'. Some people want to evaluate on dimensions different from the comparative dimensions experts use, and in such cases expert opinions are no better and no worse than anyone else's. For instance, if the primary concern of an end-user is ease-of-use or a pleasing, beautiful interface, expert programmers have no particular skills or acumen or assessing these dimensions, and so their idea of what is 'best' in these cases may or may not be reliable. We need to keep in mind what experts are (and are not) expert at before relying on their opinions.

The superlative 'best' is an extension of the term 'better', which compares values on some measurable dimension or dimensions. A community of experts has access to acumen, skills, tools, and methods for making such comparisons analytically; as such, their assessment of 'best' within their particular domain will be far more useful and accurate than the assessments of non-experts. In specific, expert programmers will have criteria for code — efficiency, simplicity, aesthetic qualities, etc — that only they can properly assess, so only they can make proper comparative evaluations.

The operative phrase, though, is 'within their particular domain'. Some people want to evaluate on dimensions different from the comparative dimensions experts use, and in such cases expert opinions are no better and no worse than anyone else's. For instance, if the primary concern of an end-user is ease-of-use or a pleasing, beautiful interface, expert programmers have no particular skills or acumen for assessing these dimensions, and so their idea of what is 'best' in these cases may or may not be reliable. We need to keep in mind what experts are (and are not) expert at before relying on their opinions.