What is the difference between Portuguese immigrants buying a house for permanent residence and a green card?

The difference between Portuguese nationality and Portuguese permanent residency lies in the right to vote (that is, the right to vote and the right to be elected). Portuguese nationality has the right to vote, but only Portugal's permanent residence has no right to vote, and other rights are the same. If we don't want to give up our nationality, we can not ask for Portuguese nationality, but only ask for permanent residency, and only ask for Portuguese nationality when the requester thinks it is appropriate.

Are temporary residence, permanent residence and citizenship the same in enjoying Portuguese welfare?

People with these three identities enjoy most of the same treatment and benefits, but only those with nationality have political rights. Regarding the Portuguese housing immigration project, once you get temporary residence, you can enjoy public education and public medical care, which is no different from permanent residence.

Is it feasible for immigrant applicants to only have permanent residence status if they want to retain their nationality?

Applicants can not participate in nationality, but only insist on permanent residence status and renew their residence permit every five years. Moreover, if you can't become a permanent resident, your residence commitment will not be revoked after five years. You only need to use the temporary residence commitment to request the Portuguese housing immigrant applicant to renew it, provided that the applicant guarantees that he owns Portuguese real estate. Therefore, those who want to renew their contracts for a long time should not sell Portuguese real estate.