I don't think there's a massive quality gap between released-in-2025 GT models and released-in-2025 Forza models. PD's models are better on average, yes, but not by that much.
Forza gets flack for the models that have been carried over from old games, and deservedly so, the bottom end of their quality range is pretty poor. PD do a great job with these by contrast - compare the 2009 Audi TT in GT6 and GT7, they are a world apart in quality especially around the grille. But new-for-series Forza models are pretty high quality these days.