This is the best Battlefront and most people I know who are obsessed with OG Battlefront don't even know it exists.
>custom class system
>custom soldier system
>New planets with every existing one re-worked to fit a smaller scale better instead of just layering on fog like the previous PSP
>Multiple new weapons like an orbital laser beacon and railgun-like sidearm
>New heroes like IG-88, Kit Fisto, Admiral Ackbar, and Asajj Ventress
>Story is a mirror to the 501st Legion and is about Han Solo's personally assembled squadron
>Entirely new Galactic Conquest mode with troop management that requires you to allocate how many units you will move between planets and maintain your army between turns. It also has a progression tree with a territory system that unlocks Generals like Han Solo or Admiral Thrawn for purchase that will give unique buffs as long as you keep the territory
>"Alternate" control scheme actually functions now
>Emulates well so you can re-map them anyway

You are missing out if you haven't played this.
The sequel Elite Squadron is nightmarishly bad and rushed as fuck but it's codename in development was Battlefront 3 if you want to glimpse what could have been first-hand.