A campaign seeking legal change generally has two routes available. They demand different resources, produce different kinds of result, and are frequently pursued together.
Litigation needs a case, not a majority
A court can be asked to act by a small number of people, provided they have a genuine dispute and can satisfy the rules on who may bring a claim.
That makes litigation available to groups without the numbers to influence a legislature, which is why it is often used where a minority interest is at stake.
The constraint is that courts decide the question in front of them, so the remedy is bounded by the case and by the legal arguments available.
Legislation needs a majority but sets terms
A legislature can design a scheme in full, creating definitions, agencies, funding and timetables that a court cannot construct on its own.
The cost is that the text is negotiated, so exemptions, thresholds and delayed commencement dates are commonly the price of passage.
Because the whole scheme is written at once, legislation can address a problem comprehensively where litigation reaches it in fragments.
Durability differs between the routes
A judicial ruling can be reversed by a later court, distinguished on its facts or displaced by new legislation responding to it.
A statute can be repealed or amended by a subsequent majority, and its practical effect can be reduced by cutting the budget of the body enforcing it.
Neither route is permanent, which is why campaigns generally continue to defend a result after it is obtained rather than treating the matter as closed.
Timing and risk are calculated differently
Litigation runs on court timetables and can take years, with the possibility that an adverse ruling creates a precedent worse than the position beforehand.
Legislative campaigns run on political calendars, where a favourable moment may be short and a missed session can mean waiting for the next term.
Organisations often prepare both, filing when a suitable case appears while continuing to work on drafting and support in the legislature.
The routes influence each other
A judicial ruling identifying a gap frequently prompts legislation, since the reasoning describes what a valid scheme would need to contain.
Legislative debate in turn generates records that courts later use when interpreting the resulting text, so the two processes are connected.
The balance between them depends on constitutional structure, standing rules and judicial powers, all of which differ by country and change over time.