Whats your favourite engine in KSP?

Jet engines: Panther and Whiplash

Lf+Ox engines: vector and aerospike

No.1 engine priority: looks and sound (no, really. I love engine exhaust with cool blue glow or other exotic type of exhaust appearance. As for sounds, I love the progressional noise like the one on OPT mods (which goes from low and the high pithed noise when afterburner activates at certain airspeed))Whats your favourite engine in KSP?

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