It's not that I'm deciding between paint schemes as much as I am frozen in what paints to invest in for it.
What products to use for painting is always a tricky decision. GW paints are mostly nice, but very pricey, and their new wash formula is... I mean, it's ok, great for glazing & blending, but it's not what it was. Plus dropper bottles in general are just superior to pop top bottles for painting. Less waste, less drying out, no risk of messing up brushes by dipping too deep when scooping paint out onto your palette.
Personally I use GW paints for colors & can't easily replace (mostly base, technical, and contrast stuff), vallejo for most other stuff. I have in the past - and will continue for as long as my current pots last - made considerable use of GW's washes, but now that they've replaced their previous wash formula with, basically thinner/more translucent contrast paints... I mean the new washes aren't bad paints, and have their uses, but they're not the same. When I run out of my existing nuln oil, that might be the motivation I need to try out oil washes.
For steel/silver metalics I use GW base colors for base coat coverage and vallejo metal color airbrush paint applied with a brush (basically think of it as pre-thinned) for layers and highlights. For yellow/gold metalics... I've waffled a lot, previously just using GW stuff, later changing to the 'liquid gold' alcohol based paints for the thinner application and higher shine, but alcohol based paints are a pain so I recently picked up some Green Stuff World pure metal pigments, which I hear can get a similar effect to the liquid gold stuff when mixed with vallejo metal medium while avoiding the hassles of alcohol-based paints, but I haven't really had the opportunity to put them to the test, so I can't really speak to their efficacy.
I also recently picked up some AK interactive streaking grime & rust streaks, plus some mineral spirits (and lacquer thinner for cleaning), to try out 'grimdark' methods on some 40k terrain, but haven't gotten around to that either. Still, if you're looking for advice on that kind of paint style, in particular what products to use and how to use them, I do recommend grimdarkcompendium.com They've got some paid memberships/course stuff if you really want to dig in, but the free introductory articles and videos are more than enough to get you started.
