Interesting that you mentioned Poets & Quants. One thing I like about their ranking is that they provide granular data under each ranking criteria, so that you can look at only the metrics that are important to you. For example, this data dump allows you to look at acceptance rate, average SAT, or % of NMS students, whichever that’s of interest to you.
P&Q stopped using GPA for a reason - because the numbers are everywhere and it would be difficult (if not impossible) for P&Q to normalize the GPA number each school provided. (Some provide weighted GPA, while others provided unweighted. Not to mention some colleges may recalculate GPA with their own formula…) However, historical GPA numbers by school are still available from the 2023 ranking here - Average GPA At The P&Q-Ranked Business Schools, from which you can get a sense of the incoming student quality at your candidate school.