You start with 1000 gold and get 2 free Necromancer Towers along with lvl 1 death rider.
Only mage and artillery are allowed.
The two paths have mostly the same enemy composition.
The differences are....
West: 2 more gorillons, 2 blood tricksters.
East: 10 more savage warriors, 10 more savage hunters, 2 jungle matriarchs, 2 witch doctors.
You can earn 3670 gold if you have killed all enemies before the last 6 gorillons.
(The gold 6 gorillons give is 960. But that's after all your artillery towers are set up.)
(1000+3670)÷2 paths=2335
With 2335, you can build either a DWAARP with lvl 1 core drill and lvl 3 furnace blast or a fully upgraded mecha.