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BANT asks about budget, authority, need and timing. MEDDIC adds metrics, an economic buyer, decision criteria and a champion. CHAMP and others reorder the same questions.
All of them are prompts for a conversation. None is a scoring system, though they are frequently sold as one.
Use the shortest one your deals justify. BANT is adequate for a transactional sale; MEDDIC earns its overhead on long enterprise cycles with several stakeholders.
Picking the elaborate one for simple deals produces theatre — fields filled in to satisfy a process rather than because anyone asked.
It is thin for complex sales and perfectly adequate for simple ones. The problem is usually the deal, not the framework.
Only if the rules are readable. An opaque score is discounted the first time it disagrees with a rep.
As fields on the deal, ideally as stage entry criteria rather than a separate form.
Half an hour with your own data usually saves reading three of these. The guides will still be here afterwards.