I prefer Alclad, Zero paints and Mr.Color C or MC range. I had bad experience with Alclad chrome as it turned white in bottle twice. Other Alclad paints were good. Also had bad experience with AK Extreme metal because it got destroyed by oil wash even if their site states that is resiliant to weathering. Other than mentioned it is great paint, easy to apply with nice metal shine.
In general my vote would go for lacquer based paints as I like quick drying, good resiliance and durability to wash or decal setting solutions.