Resin models are much more fragile and if you drop one, results can be catastrophic. Plus more vulnerable to damage in post unless well secured/packed. Advantage for manufacturers is that tooling costs etc more economic for small production runs - so if you want to make a model which is unlikely to sell more than eg 500 examples, resin is the best strategy. So resins can be much more interesting selection of weirdos and oddballs than metal die-casts which require volumes of 2000+ to match tooling costs, although 5000+ is common baseline. And resins more flexible for multiple variations of eg bodywork to produce a family of related but different models.