What's the difference between this and the Blue SSD?

Blue has 3D nand I believe, so it's a bit faster but green is more power efficient.

Is this compatible with desktops or is it purely for laptops?

Every 2.5" SATA SSD will function in a SATA compliant computer. Since all SATA connections are the same, it will work in both desktops and laptops alike. However, if your desktop case doesn't have a place to mount 2.5" SSDs, you will need to invest in a mounting bracket to adapt a 3.5" or 5.25" slot to mount a 2.5" drive.

Questions & Answers: Western Digital WD Green 1TB SSD 2.5 Internal - SATA

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Western Digital - WDS100T2G0A - WD Green WDS100T2G0A 1 TB Solid State Drive - 2.5 Internal - SATA (SATA/600) - Desktop

SLC (single-level cell) caching boosts write performance to quickly perform everyday tasks.
Shock-resistant and WD F.I.T. Lab certified for compatibility and reliability.
Ultra low power-draw so you can use your laptop PC for longer periods of time.
Available in 2.5"/7mm cased and M.2 2280 form factors to accommodate most PCs.
The free, downloadable Western Digital SSD Dashboard lets you easily monitor the status of your drive.

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