این راه از آن مسیر بهتر است، چون ترافیک کمتری دارد.

Yes, they are very similar. Both راه and مسیر can refer to a way, route, or path.

In this sentence:

• این راه = this road/way/route
• آن مسیر = that route/path

Using two near-synonyms in the same sentence is completely natural in Persian. It helps the sentence sound less repetitive. In many contexts, you could swap them and the meaning would stay almost the same.

Very roughly:

• راه often feels a bit broader and can mean road, way, or even method
• مسیر often feels a bit more like route, course, or path

But in everyday usage, there is a lot of overlap.

Here, از means than in a comparison.

So:

• بهتر است = is better
• از آن مسیر بهتر است = is better than that route

This is a very common Persian pattern:

• X از Y بهتر است = X is better than Y
• X از Y بزرگ‌تر است = X is bigger than Y
• X از Y سریع‌تر است = X is faster than Y

So although از often means from, in comparisons it usually means than.

بهتر is the standard comparative form of خوب (good), just like English better is the irregular comparative of good.

So:

• خوب = good
• بهتر = better
• بهترین = best

Although Persian often makes comparatives by adding -تر, some words have special common forms. بهتر is the normal and natural word here.

است is the formal written form of is.

So:

• بهتر است = is better

In spoken Persian, است is often shortened or dropped:

• بهتره = common spoken form of بهتر است
• Sometimes the copula is omitted in very informal speech, depending on context

But in standard written Persian, است is completely normal and expected.

Yes. چون here means because.

So:

• چون ترافیک کمتری دارد = because it has less traffic

It introduces the reason for the first statement.

Common Persian words for because include:

• چون = because
• زیرا = because, since, more formal
• به خاطر اینکه = because, due to the fact that, more conversational/expanded

In everyday Persian, چون is very common.

That is just a very natural Persian structure.

Literally:

• ترافیک = traffic
• کمتر = less
• کمتری = less / a smaller amount of
• دارد = has

So the phrase means it has less traffic.

Persian often uses داشتن (to have) in cases where English might say:

• there is...
• it has...
• it experiences...

For roads, routes, cities, times, and places, using داشتن with things like traffic, noise, facilities, problems, etc. is very common.

For example:

• این خیابان ترافیک زیادی دارد. = This street has a lot of traffic.
• آن منطقه امکانات خوبی دارد. = That area has good facilities.

This is a very common learner question.

کمتر means less/fewer.

But in ترافیک کمتری, the -ی helps turn it into an indefinite adjectival form, something like:

• less traffic
• a lesser amount of traffic

So:

• ترافیک کمتر can sometimes be seen, but
• ترافیک کمتری is more natural here

This pattern is very common after a noun:

• وقت بیشتری دارم = I have more time
• پول کمتری لازم است = Less money is needed
• مشکل بیشتری دارد = It has more problems

So کمتری is not plural here. It is part of a common Persian structure used with comparatives in indefinite noun phrases.

It is grammatically singular in form, but semantically it works like the uncountable English noun traffic.

So:

• ترافیک = traffic

You do not usually pluralize it in this kind of sentence. Persian treats many borrowed mass nouns similarly.

That is why the sentence talks about less traffic, not fewer traffics.

Persian word order is often Subject + other elements + verb, with the main verb usually coming at the end of the clause.

In this sentence:

• این راه = this route
• از آن مسیر = than that route
• بهتر است = is better

Then:

• چون = because
• ترافیک کمتری = less traffic
• دارد = it has

So Persian builds toward the verb, especially in the second clause, where دارد comes last.

This is very normal Persian syntax.

Because Persian often leaves out subjects when they are clear from context.

In English, we say:

• This route is better than that route because it has less traffic.

In Persian, the it is understood:

• چون ترافیک کمتری دارد

The hidden subject is this route.

Persian does this all the time. If the subject is obvious, it often does not need to be repeated.

A very natural spoken version would be:

• این راه از اون مسیر بهتره، چون ترافیک کمتری داره.

Main differences:

• آن becomes اون
• است becomes ه
• دارد becomes داره

So:

• written/formal: این راه از آن مسیر بهتر است، چون ترافیک کمتری دارد.
• spoken: این راه از اون مسیر بهتره، چون ترافیک کمتری داره.

Both mean the same thing.

Yes, but the tone changes a bit.

Examples:

• این راه از آن مسیر بهتر است، چون ترافیک کمتری دارد.
• این راه از آن مسیر بهتر است، زیرا ترافیک کمتری دارد.
• این راه از آن مسیر بهتر است، برای اینکه ترافیک کمتری دارد.

Differences:

• چون = very common and natural
• زیرا = more formal, more literary/written
• برای اینکه = conversational but a little more expanded

In most everyday situations, چون is probably the best choice.

A few useful points:

• این is pronounced roughly in
• آن is pronounced roughly ân
• مسیر is roughly masir
• بهتر is roughly behtar
• چون is roughly chun
• ترافیک is roughly terâfik
• کمتر is roughly kamtar
• دارد is roughly dârad

In connected speech, learners will often hear reduced spoken forms such as:

• اون instead of آن
• بهتره instead of بهتر است
• داره instead of دارد

Those reductions are extremely common in everyday conversation.