Those platforms solve different problems. PrepLounge and CaseCoach are built around peer practice rooms and case libraries: you're often paired with another candidate, and your feedback depends on who you happen to get that day. Leland is an open marketplace where anyone with consulting experience can list themselves as a coach, pricing runs anywhere from $100 to $650 an hour, and there's no standard way to compare one session against another.
Before you book on a marketplace, you'd need to figure out something a profile page won't tell you. Does this person have an actual model for developing your skill set, or are they just someone smart enough to crack a case themselves? Have they seen the specific ways a candidate gets stuck and actually pulled someone out of it? Have they led a team, managed people, sat on the other side of a real client engagement? Those are the things that let someone develop you, not just quiz you. Landing an offer is the finish line, but what actually gets you there is becoming someone who thinks and communicates like a consultant, not someone who memorized how to survive one interview.
CaseBasix is a self-study video course and question bank, with 1:1 coaching sold separately as an add-on. MyConsultingCoach packages hours with ex-MBB coaches but, like the others, doesn't score you against a fixed benchmark from session to session.
None of them run every candidate through the same standardized rubric. I worked at Roland Berger and Monitor Deloitte, and received offers from Kearney, Strategy&, EY-Parthenon, Accenture, and Oliver Wyman across 11+ years in the industry. I made that jump without a business degree, coming from academia, and built this system myself because nothing generic was built for someone starting where I started. I've since coached 60+ candidates to offers using the same 7-module scoring system every time. You're not hoping you got a good coach that day. You're being measured against the same bar every candidate I've worked with gets measured against, and you get that in writing.