Question: Gas or Oil

When looking through some replacement shocks to replace my busted one (KYB G-Shock) I have noticed there are two types they do oil and gas and they have a pretty big price difference too. Just wondering what the difference would be

Cheers
 
managed find this one but it advertises for all micras so not to sure fleabay: 321126142737
eBay item number:
 
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