Gaia Versions- Which one should you choose?

Gaia 2 - (2019.3 - 2020.3 Unity Versions) 

* Multi Tile Support

* GPU Accelerated Stamping

* GPU Accelerated Spawning

* Built In, URP, HD SRP

* Biome Presets

* Stackable Filtering

* FREE upgrade from Gaia 1
 

Gaia Pro  - (2019.3 - 2020.3 Unity Versions) 

* All of Gaia 2 PLUS:

* Massive World Creation Support

* Non Destructive Massive World Edit Support

* Massive World Streaming & Culling Support:

* Additional stamping & erosion operations

* Additional masking operations

* Mask exporting system

* Spawnable VFX system and assets

* Spawnable Sound FX system and assets:

* Integrated Weather System with rain and snow

* Time of Day Lighting System

* HQ Photogrametry Enhanced Biome Assets & Presets

* Multiple pre-configured biomes

* Streaming Land 

* Imposter Terrain Creation 

* Low Poly Terrain Creation

Gaia Pro 2021: Requires 2020.3 and above (TBD). 
* Mult-tile support

* GPU Accelerated Stamping

* GPU Accelerated Spawning

* Built In, URP, HD SRP

* Stackable Filtering

* Massive World Creation Support

* Non Destructive Massive World Edit Support

* Massive World Streaming & Culling Support:

* Additional stamping & erosion operations

* Additional masking operations

* Mask exporting system

* Spawnable VFX system and assets

* Spawnable Sound FX system and assets:

* Integrated Weather System with rain and snow

* Time of Day Lighting System

* HQ Photogrametry Enhanced Biome Assets & Presets

* Multiple pre-configured biomes

* Streaming Land 

* Imposter Terrain Creation 

* Low Poly Terrain Creation

* World Designer - fully procedural world generator

* Flora Grass / Detail System - accelerated grass system (HDRP beta)

* Photo Mode - awesome runtime photo creation system

* World Space Masks - world space image and distance masks

* Terrain Addition / Deletion support - dynamically grow your world

* Biome Based Stamping - shape your terrain as part of your biome

* Terrain Stitching Tool - dynamically connect terrains to remove gaps

* GAIA API - call Gaia functions within editor.

Gaia 2021: Requires 2020.3 and above (TBD). 

* Multi Tile Support

* GPU Accelerated Stamping

* GPU Accelerated Spawning

* Built In, URP, HD SRP

* Biome Presets

* Stackable Filtering

* World Designer - fully procedural world generator

* Photo Mode - awesome runtime photo creation system

* World Space Masks - world space image and distance masks

* Terrain Addition / Deletion support - dynamically grow your world

* Biome Based Stamping - shape your terrain as part of your biome

* Terrain Stitching Tool - dynamically connect terrains to remove gaps

* GAIA API - call Gaia functions within editor.

The main differences between Gaia 2021 and Gaia Pro 2021: 
Gaia Pro 2021 -

- Terrain Streaming/world streaming. 

- Multiple Biomes not included in Gaia 2021

- Weather system 

- Sky and Lighting System 

- Audio System 

- VFX System 

- Imposter Terrain Creation 

- Low Poly Terrain Generation 

- Flora Grass System (it does work in all pipelines right now - as far as the grass is concerned) 

- Additional Masking and stamping operations