Choose a Sniper or Mage.
This is because their long range lets them stay near their turret while attacking minions further out. These heroes are able to focus on landing killing blows on these minions to earn gold. Additionally, the wide-open lane often gives these heroes more warning when opponents enter the area, giving them some time to back off.
It’s important to have a Sniper or Mage when attempting to take down enemy turrets later in the game. This forces defenders to move out much further when attempting to stop the siege.