Levantine Arabic vs Moroccan Darija

Low in the Levantine-to-Darija direction. Moroccans typically follow Levantine reasonably well thanks to Syrian and Lebanese television; Levantines rarely follow Darija without practice. Almost every high-frequency word differs — بدي against بغيت, هلّق against دابا, منيح against مزيان.

The differences, side by side

Levantine ArabicMoroccan Darija
The letter قGlottal stop in the cities — قلب is said albeUsually kept as q, sometimes g — قلب is qalb
The letter جSoft j, as in French "jour" — جميل is jamiilSoft j — جميل is jmil
Present tenseb- prefix: بكتب (baktob), "I write"ka- or ta- prefix: كانكتب (kanktib), "I write"
Future tenseرح (rah) or ha-: رح اكتبغادي (ghadi) or غا: غادي نكتب
Negationما before the verb: ما بعرفما...ش around the verb: makanktibsh
"What?"شو (shu)شنو (shnu) / آش (ash)
"Now"هلّق (halla2)دابا (daba)
"I want"بدي (baddi)بغيت (bghit)
"Good"منيح (mnee7)مزيان (mezyan)

The same phrases in both

EnglishLevantine ArabicMoroccan Darija
helloمرحبا mar7abaالسلام عليكم s-salam 3alaykum
how are you?كيفك؟ kifak?كيف داير؟ kif dayer?
thank youشكرا shukranشكرا shukran
happy birthdayكل سنة وإنت سالم kull saneh w inta salemعيد ميلاد سعيد 3id milad sa3id
good morningصباح الخير saba7 el khayrصباح الخير sba7 lkhir
good eveningمسا الخير masa l-kheirمسا لخير msa lkhir
goodbyeمع السلامة ma3 as-salamehبسلامة bslama
pleaseلو سمحت law sama7tعافاك 3afak
excuse meعفوا 3afwanسمح لي sme7 li
I'm sorryانا اسف ana aasefسمح لي sme7 li
yes and noإيه ولأ eh w la2اييه و لا iyyeh w la
my name is...اسمي ismiسميتي smiti

Which one should you learn?

Follow your destination. Neither one will help you much with the other, so the practical question is whether you are heading to the Levant or to Morocco.