Friday is the best day in the whole week and we have authentic Hadeeth Ahlul Bayt (AS) that Friday is more important than Eid Al-Fitr and Eid Al-Adha. Wahabis are against saying Jumma Mubarak because they went very far away from Ahlul Bayt.
'Saying Jumma Mubarakah is good just like saying Eid Mubarak in Eid Al-Fitr or Eid Al-Adha.
Wassalam.