You Greeks are always children!
Jean Gabin in La Grande Illusion
My husband and I own the Force awakens set. We just played it for the first time the other day and had a blast. I wanted to get my husband some of the expansions so we could have bigger armies. Which ones would you recommend?
The basic rule is this: buy the ships that interest you. They are all fun and all come with great and useful upgrades. So if you want to field Darth Vader, get the TIE Advanced expansion. If you are a fan of Rey or Poe, get the Heroes of the Resistance expansion.
If I had to pick one favorite expansion, it would be Imperial Aces. It comes with the scenario "cutting the cord" which is a blast. Many of the earlier waves come with really fun scenarios.
And a warning: I bought the same core for my nephews two years ago. I currently own 2-3 copies of each expansion. The game is a blast and addictive to the 9th degree. So be careful out there.