Prefiero ese porque parece más cómodo.

Because preferir is a stem-changing verb in the present tense.

In most present-tense forms, the e in the stem changes to ie:

• yo prefiero
• tú prefieres
• él/ella prefiere
• nosotros preferimos
• vosotros preferís
• ellos prefieren

So prefiero means I prefer. This is a very common pattern in Spanish.

Spanish often leaves out subject pronouns when they are not needed, because the verb ending already shows who the subject is.

• Prefiero = I prefer
• Yo prefiero = I prefer, but with extra emphasis or contrast

So in this sentence, yo is understood automatically.

Ese means that one or that.

Spanish demonstratives often show distance:

• este = this / this one (closer to the speaker)
• ese = that / that one (a bit farther away, often near the listener or not especially close)
• aquel = that over there / that one over there (far from both)

So Prefiero ese means I prefer that one.

Because Spanish can use demonstratives on their own, just like English this one or that one.

If the noun is already clear from context, you can leave it out:

• Prefiero ese sofá = I prefer that sofa
• Prefiero ese = I prefer that one

So ese is standing in for a masculine singular noun.

Because it refers to a masculine singular noun, even if that noun is omitted.

Forms change to match the noun:

• este / ese / aquel = masculine singular
• esta / esa / aquella = feminine singular
• estos / esos / aquellos = masculine plural
• estas / esas / aquellas = feminine plural

So if the hidden noun were something like sofá or coche, ese fits.

This is a very common question.

• porque = because
• por qué = why

In your sentence, porque introduces the reason:

• Prefiero ese porque parece más cómodo.
  = I prefer that one because it seems more comfortable.

Compare:

• ¿Por qué prefieres ese?
  = Why do you prefer that one?

Parece means seems or looks.

So:

• es más cómodo = it is more comfortable
• parece más cómodo = it seems / looks more comfortable

Using parece makes the statement less absolute. The speaker is judging based on appearance or impression, not stating a confirmed fact.

It comes from the verb parecer, which means to seem or to appear.

Here it is in the third person singular:

• parezco = I seem
• pareces = you seem
• parece = he/she/it seems

In this sentence, parece refers to the thing indicated by ese:

• ese parece más cómodo = that one seems more comfortable

Más cómodo means more comfortable.

Spanish usually forms the comparative with:

• más + adjective = more + adjective

Examples:

• más cómodo = more comfortable
• más barato = cheaper / more inexpensive
• más grande = bigger

So parece más cómodo means it seems more comfortable.

Because the adjective has to agree with the noun it describes.

If ese refers to a masculine singular noun, then the adjective must also be masculine singular:

• ese ... cómodo
• esa ... cómoda

For example:

• Prefiero ese sofá porque parece más cómodo.
• Prefiero esa silla porque parece más cómoda.

It gives the reason for the preference.

The sentence has two parts:

• Prefiero ese = main idea
• porque parece más cómodo = reason/explanation

So porque links the choice to the reason behind it.

You could, but it would change the meaning slightly.

• ese = that one
• aquel = that one over there / that one farther away

So aquel suggests greater distance.

Also, modern spelling usually does not use an accent on demonstratives:

• ese, aquel, este

Older texts or older teaching materials may show aquél, but current standard Spanish normally writes aquel without an accent.

In most of Spain, the c in cómodo before o sounds like a normal k sound, so no surprise there.

The most noticeable Spain feature in this sentence is not huge, but if there were a z or c before e/i, many speakers in Spain would use the th sound as in think. For example:

• gracias in much of Spain sounds roughly like GRA-thyas

In your sentence:

• Prefiero ≈ pre-FYE-ro
• ese ≈ EH-se
• porque ≈ POR-ke
• parece in most of Spain ≈ pa-RE-the
  because the c before e is often pronounced like English th
• más cómodo ≈ mas KO-mo-do

That said, pronunciation varies across Spain too.

Yes, but the original order is the most natural in many contexts.

Standard:

• Prefiero ese porque parece más cómodo.

You could also say:

• Porque parece más cómodo, prefiero ese.

This puts more focus on the reason, but it can sound a bit more marked or less neutral. In everyday speech, the original version is usually more natural.