Understanding the fundamental differences between these two styles of play will help you find the right game for your taste.

Both genres share a common ancestry, tracing their roots back to custom map modifications in classic RTS titles.
The Old-School Formula
The player's sole objective is to build static structures along a predetermined path to stop incoming waves of enemies.

It is a test of endurance, mathematical optimization, and predicting AI movement patterns over long play sessions.
Player vs. Environment is the core.You wait for the enemies to come to you.Pacing is generally slow and methodical. The Modern Tower Rush
You are actively deploying mobile troops that march down lanes while also managing your own defensive structures.

There is no pausing, no endless waves, and every single deployment decision has immediate, potentially game-ending consequences.
Game AspectTower DefenseTower RushMain GoalProtect the core from AIWin the PvP duelPlayer ActionBuilding mazesDeploying mobile units and casting spells Choosing Your Genre
Both genres offer incredible depth and satisfaction, but they cater to very different psychological needs.

Many gamers enjoy having both types installed on their devices to suit different moods throughout the day.