It's a personal choice, but Krav Maga would be excellent if integrated with MMA, boxing, or Muay Thai.
MMA will give you more skills overall than boxing; grappling, boxing, kicking. The transition of MMA skills into Krav Maga is very formidable with regards to self defense.
I've been practicing Krav Maga for years. Some of the most formidable kravists I know have a MMA, boxing, or Muay Thai, or BJJ background.
Best of luck.