10 years ago I sat at my kitchen table with a bottle of the latest acrylic in one hand and MM enamel in the other and asked this same question. I was at a cross-roads for sure and I liked both. A few factors that I had to take into account before making my decision. Acrylics are generally non-toxic, more user-friendly and safer to clean up and use (using non-toxic solvents). On the down side the adhesion to plastic is not as strong as enamels, special preparation must be done to the bare plastic, most can't be masked with normal masking tapes, care must be taken not to mix brands of acrylics and you cannot apply enamels or Laquers over some acrylics. Additionaly, some acrylics are tricky to thin and sensitive to mixing ratios. Enamels on the other hand are very easy to thin(using inexpensive plain mineral spirits), airbrushes excellent and paint brush. Enamels have superior adhesion to model styrene and other surfaces than acrylics, they can be masked with normal masking tapes, can take any oil-based paint additive for special effects(oil paint mediums), and gloss colors can even be buffed to near glass-like finishes for car modelers! Highly important for most modelers in general...the color range of enamels such as the Testors MM line is extensive to say the least. Most acrylic brands with the exception of Gunze Sangyo Acrylic Colors and Floquil Polly Scale acrylics; the color range is very limited, requiring mixing formulas and a lot of trail and error. Although containing toxins that if "miss-used" can eventually, over time harm me; I prefer enamels hands down. I've learned how to use enamels over the years and I couldn't be happier or more satisfied, as are most modelers. Just take the nessessary precautions to protect yourself with the use of a respirator when airbrushing and spraying and you'll make the transition to enamels gracefully as I have.
1/72nd scale Hasagawa F-16C wearing Testors MM II enamels. Depicting the "Fighting Fulcrums" 414 CTS, 57th Wing, Nellis AFB
Greg Williams
Owner/ Manager
Modern Hobbies LLC
Indianapolis, IN.
IPMS #44084