Are you looking for land access in order to gain affordable and secure access to housing?

If you're exclusively looking for secure housing access, the Housing Cooperatives is your best fit.

Do you want to live communally or have your own plot of land to live on with your family?

If you desire a communal lifestyle, many of the land access models are designed for or have incorporated some communal/sharing component to it, such as Agrarian Commons, Cooperatives, and leasing properties on land owned by some Community Land Trusts which encourage communal living.
If you do not desire a communal lifestyle with shared access to a piece of land, then you may consider leasing land from Conservation Nonprofit or buying land protected by easements. Some Community Land Trusts also provide land for individuals who desire a non-communal lifestyle.

Will this land be a means of your livelihood and sustaining yourself and/or your family?

If you wish to carry out some kind of commercial practice on the land, you have to be cautious with land-use restrictions placed by Community Land Trust, Nonprofits owning the land, or by an easement.
Cooperatives can take on many forms and support a wide range of commercial practices.
For agricultural purposes, see below.

Do you want to farm the land, for subsistence, for low-cost community food access, or commercially?

If you want to farm your land as a means of subsistence, make sure the land access model you look for does not necessitate you to take part in commercial farming, such as a Farming Cooperative which has a commercial element central to its operation.
If you want to farm by yourself for either commercial or community food access, you can look to acquire farmland protected under agricultural easement or lease from Nonprofits. If you look to farm with a larger group or have some level of collaboration with nearby farmers: an Agricultural Cooperative works best for commercial purposes. Agrarian Commons and Community Land Trust work better for non-commercial purposes such as providing low-cost food access to the community.

Do you want to secure some land for conservation purposes?

If you want to permanently conserve some/all pieces of the land you access or restrict land use to certain purposes, you can look for land protected with easements or plan to place your land under easement once you've acquired it. Land owned by Agrarian Commons is also protected for agricultural purposes only.