interesting question...
can't say i have a favorite type of paint...
i enjoy painting with metals, but am itching to try
NMM...
i don't use many pre-made washes straight out of the pot, but mix a lot with P3 Armor Wash, or P3 Flesh Wash, and the regular P3 paints, or just thin out the paint with water to make a wash...
i use P3 inks, thinned way down, for glazes...
i haven't tried any specialist paints yet, but really like the look of weathering powders...
i'd also like to try out some of the specialized base paints, and water effects...
there is so much experimenting still to try...
even after 30 years of painting, and 12 years doing this as my job, i feel like there is a whole world of painting out there still to try...
the only problem is that my queue is always full, and painting to deadlines, or clients' specifications, make finding the time to experiment very difficult (i know, First World problems, right???)...
since i feel like i finally perfected the
GW method of painting a few years ago, i have been playing around with taking my style to the next level, with more subtle and technically difficult paintwork, instead of
GW's very simplistic, unrealistic style...
long story short, the humble regular pot of P3 acrylic paint is what i'm all about

...
figuring out what i can do with it, instead of buying all kinds of specialized paints, is pushing me constantly to be a better painter...
cheers
jah