Whats your favourite engine in KSP?

I dimly recall NathanKell mentioning he used a formula to rebalance the engines around 1.0, and it was likely related to his spreadsheet for RealFuels (or the actual spreadsheet) because he also based the current values on the theoretical maximums of Aerozine50/NTO engines IRL (which fits pretty nicely into vanilla KSP for various reasons). Before 1.0 the engines were a mess of values that tried to fit into niches and they didn't do that very well, not the least because there are really only two "niches" for rocket engines because of how de Laval nozzles work. It really wasn't that bad but there were definitely some engines that got pretty much zero use, unlike the current version where every engine can play a role because they're much more homogeneous.

Rather than being sneaky the game designer (in this case, NathanKell, IIRC) was just basing the new engine values on how actual, real world rockets work. Sea level engines have nozzle optimized for higher atmospheric pressure which generally results in lower isp but a much tighter isp range (and thus better constant thrust) where vacuum nozzles are pretty much useless at sea level because they have troubles overcoming the pressure of the atmosphere.Whats your favourite engine in KSP?

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