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Gasoline cars burn. And explode, if there's enough vapor sitting in the tank when they catch fire.
CNG tanks explode. Gruesomely. Spectacularly. Awesomely. With much fire and shrapnel.
LPG/LNG tanks explode. With fire. Though in automotive use, they're designed with safety valves to release pressure long before they get close to CNG pressures.
Batteries explode. With fire.
A properly designed hydraulic tank will blow pressure out whatever safety valve or failsafe is built into the system in whichever direction said safety valve is facing.
The only system actually safer than a hydraulic bottle would likely be a diesel, since diesel fuel doesn't explode at ordinary pressures.
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