Yeah, who ya gonna trust? The topic of “SPICE models” leads to the topic of “validating SPICE models”. If several manufacturers make the part, they may publish models with wildly different parameter values. From experience and reputation you may come to trust some manufacturers’ published models more than other manufacturers.
Seldom will anybody even make the effort to compare simulation results to the part’s datasheet, much less a sample of production parts. If you do this exercise a few times you may appreciate that simulation models are often optimized for accuracy under certain operating conditions - high current, or low voltage, or a particular frequency range, etc. And, models may not represent the “design center” performance from the datasheet.
After the manufacturer, try seeding a search engine with " SPICE " and the device type, e.g. " SPICE MPSA42 ". You might uncover models published by manufacturers who used to make the part, or models created by somebody with the knowledge and facilities to make an improvement on a manufacturer’s model. You will also uncover individuals and organizations who have collected SPICE models over the years. The Yahoo LTSpice User’s Group, and the LTWiki pages, are organizations with extensive model collections that don’t always show up in search engine results. And, you can always ask others with a similar interest to share models with you on sites like “Electronics101”, EDABoard, DIYAudio, or several Ham Radio sites.
p.s. - Thanks for putting some information on your profile page!