For Tower Battles / Battlefront speedrunning, the best all-around pick from the info I found is Phaser. It is described as strong at low levels, easy to use, mobile, and able to deal high damage to major bosses, which makes it a good choice when you want to clear a level fast.

Why Phaser stands out

  • It has high damage and good survivability.
  • It can move, unlike some stronger stationary towers.
  • It stays useful across most of a run, which matters more than pure max-level damage.

Other strong options

  • Zed : very well-rounded, fast, and strong early.
  • Tweeter : cost-efficient and can make money while still dealing solid damage at higher levels.
  • Golden Commando : high DPS, but being stationary at max level can slow practical speedruns.

Practical pick

If your goal is just to speed run a level , Iā€™d start with Phaser first, then Zed if you want a more aggressive, mobile style. For newer players, Phaser is usually the safer and more consistent answer.

TL;DR: Phaser is the best speedrun tower here, with Zed as the main alternative.