First off, if you know that you want to go to a specific country or region, that should make your decision for you. Going to Lebanon with Libyan Arabic is a good way to make sure that you are chronically misunderstood. In some cases, such as Morocco or Egypt, it is also important to check what region of the country you are going to. A Tangier Dialect in Agadir or a Cairene Dialect in Hurghada is probably not going to be as effective as you may wish.
If you want to be able to visit a wide-variety of Arabic-speaking countries, you might want to try learning a Levantine Dialect like Palestinian, Jordanian, or Lebanese. If you want to watch Arabic-language television you may wish to learn Egyptian. Additionally, Egyptian is commonly known throughout the Arabic World because of television, but note that you may have a lot of one-way conversations because it is difficult to learn other dialects from an "Egyptian base".
Whether you should learn standard Arabic or a dialect depends entirely on why you are learning the language in the first place. Generally, if you want to talk to people in informal settings, a dialect is better to learn. If you want to read, write, and conduct official business, learning MSA (also called Fus-ha) is better. Egyptian Arabic and various Levantine Arabic dialects are relatively close, like say Spanish and Catalan. While most Levantine Arabs will understand Egyptian Arabic, since Egypt dominates the Arab-language media, most Egyptians will not understand Levantine Arabic at 100% clarity.
Modern Standard Arabic is the "Classic Arabic" which is spoken in the new , T.V shows , but not in real life , and any one wanna learn Arabic first , he should learn Modern Standard Arabic , because you can then communicate with any one. But Egyptian Arabic OR Egyptian Dialect, it is spoken in Egypt alone though alot of ppl understand the Egyptian dialect, any way you can know alot about that , and learn Arabic either, through online on this site: http://www.arabicollege.com where you can learn Arabic in Live Video Interactive Classes with native Arabic teachers available 24/7 to serve you. any time you like.
Arabic
I think it's the Lebanese dialect
Arabic.
Standard Arabic is the standard written Arabic that has been standardized throughout the Arabic-speaking nations, the language of the Muslim holy book, the Quran. Egyptian Arabic is the spoken Arabic dialect that has been widely accepted as the easiest spoken dialect to understand throughout the Arabic-speaking nations. Yet, it is quite different in pronunciation, spelling, and grammar from the Standard Arabic.
"Nine" in the Egyptian Arabic dialect is tisah.(say:TISS-a-IA)
It is best that they do, since the Quran is recited in Arabic and no translation is perfect, but it is not an obligation to learn Arabic.
Egyptian
dialect
The Najdi dialect of the Arabic language is most often heard in the deserts and oasis areas of Saudi Arabia. It is mainly spoken by the Bedouin peoples.
The dialect of Arabic used in Lebanon is a Semitic language like all other dialects of Arabic.