Nos decantamos por una opción siempre que sea correcta.

Decantarse por is a fixed, pronominal expression meaning to opt for, to go for, or to lean toward something.

So nos decantamos por una opción means something like:

• we opt for an option
• we go for one option
• we settle on one option

It often suggests a preference after considering alternatives, not just a neutral choose.

Here, nos is not an object meaning us in the usual sense. It is part of the pronominal verb decantarse.

The full verb is:

• decantarse por algo = to opt for something

So in different persons you get:

• me decanto
• te decantas
• se decanta
• nos decantamos
• os decantáis
• se decantan

In this sentence, nos decantamos means we opt or we lean.

Because the verb pattern is decantarse por + noun.

So you say:

• decantarse por una opción
• decantarse por la más barata
• decantarse por el plan A

The preposition por is required by this expression. It is not usually translated word-for-word into English; it is just part of how the verb works.

Decantamos is present indicative, first person plural: we opt / we choose / we go for.

Formally:

• infinitive: decantarse
• tense: presente de indicativo
• person: nosotros/nosotras

Depending on context, the English translation could be:

• we opt for
• we tend to opt for
• we choose

Because siempre que here means provided that / as long as, which introduces a condition, so Spanish normally uses the subjunctive.

• sea = present subjunctive of ser
• es = present indicative of ser

So:

• siempre que sea correcta = as long as it is correct / provided that it is correct

The speaker is not stating a fact; they are giving a condition.

Here siempre que means:

• as long as
• provided that
• so long as

That is why the sentence has a conditional feel:

• Nos decantamos por una opción siempre que sea correcta.
• We opt for an option as long as it is correct.

A useful point: siempre que can also mean whenever, but when it has that more factual/repeated-time meaning, it often goes with the indicative instead of the subjunctive.

Yes. The choice changes the meaning slightly.

• siempre que + subjunctive → provided that / as long as
• siempre que + indicative → often whenever

Compare:

• Iremos siempre que haya tiempo.
  We’ll go as long as there is time.
  → condition, so subjunctive

• Siempre que hay tiempo, vamos.
  Whenever there is time, we go.
  → habitual fact, so indicative

In your sentence, sea shows the conditional meaning.

Sea comes from ser and is the present subjunctive form for:

• yo sea
• él/ella/usted sea

In this sentence, it corresponds to una opción, which is singular, so the implied subject is ella:

• una opción ... sea correcta

So literally, it is provided that it be correct, though natural English would usually say provided that it is correct.

Because correcta agrees with una opción, which is a feminine singular noun.

• una opción correcta
• la opción es correcta

Spanish adjectives must agree in gender and number with the noun they describe.

So:

• opción = feminine singular
• correcta = feminine singular

It can mean correct, but depending on context it may also suggest:

• right
• appropriate
• valid
• the proper one

So sea correcta does not always have to mean mathematically or factually correct. It could mean the right option or an acceptable option in context.

Yes, but the nuance changes.

• elegimos una opción = we choose an option
• nos decantamos por una opción = we opt for an option / we lean toward an option

Decantarse por sounds a bit more like settling on one possibility after considering others. It can feel slightly more deliberate or nuanced than the plain verb elegir.

Both are possible, depending on meaning.

• una opción = an option / one option
• la opción = the option

Using una opción keeps it general: we go for an option, as long as it is correct.

If the speaker had a specific option in mind, they might say:

• Nos decantamos por la opción correcta.
• We opt for the correct option.

Your sentence is more about the rule or principle behind the choice.

It is generally neutral to slightly formal.

• decantarse por is common and natural, especially in careful or standard language.
• In very casual speech, someone might say something simpler like elegimos or vamos con depending on context.

So the sentence sounds perfectly normal, but a bit more polished than the most basic everyday wording.

Yes. A few common alternatives are:

• Elegimos una opción siempre que sea correcta.
• Nos decantamos por una opción si es correcta.
• Optamos por una opción siempre que sea la correcta.

These are all close in meaning, but your original sentence is very natural and shows two useful structures:

• decantarse por
• siempre que + subjunctive