Prestativo vs. prestável
The words prestativo and prestável are synonymous adjectives used to describe a helpful or obliging person. They share the same root and general meaning, but the primary distinction lies in regional usage between Brazil and Portugal.
Prestativo
B1This word describes a person who is proactive, attentive, and always ready to serve or give assistance. It is the standard and most common term used in Brazilian Portuguese.
O funcionário da loja foi muito prestativo e resolveu o meu problema.
(The store employee was very helpful and solved my problem.)
Ela é uma vizinha prestativa que sempre se oferece para regar as plantas.
(She is an obliging neighbor who always offers to water the plants.)
Precisamos contratar alguém que seja educado e prestativo.
(We need to hire someone who is polite and helpful.)
João foi prestativo ao carregar as malas pesadas para a sua tia.
(João was helpful by carrying the heavy suitcases for his aunt.)
Seja mais prestativo com os seus colegas de trabalho.
(Be more obliging with your coworkers.)
Prestável
B1This word describes a person capable of rendering service, who is useful, and willing to help. While understood in Brazil, it is the preferred and standard term in European Portuguese.
O senhor da receção foi extremamente prestável connosco.
(The gentleman at the reception was extremely helpful to us.)
Ele é um rapaz muito prestável e está sempre disponível para ajudar.
(He is a very obliging young man and is always available to help.)
A Joana mostrou-se prestável em situações de crise.
(Joana showed herself to be helpful in crisis situations.)
É raro encontrar alguém tão prestável como o teu irmão.
(It is rare to find someone as obliging as your brother.)
Tenta ser prestável e ajuda a levantar a mesa.
(Try to be helpful and help clear the table.)
Summary
In essence, both words mean helpful. If you are speaking Brazilian Portuguese, you should use prestativo. If you are speaking European Portuguese, you should use prestável. While prestável can occasionally imply serviceable regarding things, both are primarily used to evaluate how helpful a person's character is.