1) resin doesn't warp, I do own and have sold hundreds of them over a span of 15 yrs.

2) nearly all makers only make either resin or diecast. So the brand already tells it.
(Exceptions: some like CMR and BBR have resins and diecast in their range. Motorhelix, too.)

3) if anything opens, it is always diecast (apart from a handful mega-costly special makers).
Or - in the case of AutoArt – plastic.

4) if the car steers, it is also diecast even if it is an otherwise sealed car.
(Exception: Cult Scale, Neo and Matrix made some primitive slightly steering models. But these are very niche.)

5) resins always have wobbly foil windows that tend to warp (indeed) or pop off at corners.
That's why I go resin mostly for F1 or prototypes of possible.

6) usually dealers mention the material. If not, just google the car for a review.

7) go to diecastsociety.com and search for the cars, they all were shown there and/or reviewed.

8) if nothing works for you, just ask here or in another forum for the car(s) you want.
Someone will know about it.


PS some cheaper sealed model makers like MCG or Ixo have very good diecast models, but they are technically crude like resins.
No steering, no chassis detail to speak of.

And several labels like KK Scale are made by iScale with cheap molds which have straight incorrect looking rockers, a sign of primitive modeling.
Others like Werk83 - partly produced by Z Models / Solido – at times have these abysmal rockers, too, but then they also make rather good and straightforward cars.