I would not build your application strategy around the idea that one MBB firm is consistently the 'low GPA firm.' Screening practices vary by office, school, recruiting channel, and year, so a reputation you hear from one candidate may not transfer to your situation.
Apply to all three if you are genuinely interested. Then improve the signals that each recruiter can evaluate: impact on the resume, leadership, relevant experience, networking, and a clear explanation of any unusual academic context if the application gives you space.
If your GPA is materially below the normal range, this guide on minimum GPA expectations for consulting can help you frame the risk. The important question is not which firm is lenient; it is whether your overall profile is strong enough to earn an interview at each office.