Hi all!
Acrylics, oils or enamels can produce good results painting figures. Each kind of paint have its own method of painting, so I think results depends on your own style and techniques. I have been using both enamels and Vallejo acrylic colours for a long time and acrylics are really popular paints nowadays. But I want to say is that no matter what you use because the difference is what you want to paint indeed.
There was a deep change in figure painting concept one decade ago (just after acrylics arriving to the market) and changed to `light from above` concept (zenithal light?) but the fact is that you can get same effect using different paints because the change was about the painting concept, not the medium itself.
So use the paint you like the most, specially if you are talking of small figures (1/72 - 1/48) for aircrafts, any will work fine undoubtely.
Best regards!
Lu