Claude
Best for: careful pack-out instructions, risk lists, claim-language caution.
Weak at: live carrier rate tables without you pasting data.
ChatGPT
Best for: fast iteration, tables, multipack scenarios, draft SOPs.
Weak at: confidently wrong “standard box sizes” if you do not anchor with measurements.
Gemini
Best for: pulling public material/spec context and comparing published options when browsing is allowed.
Weak at: warehouse-specific constraints you never stated.
Perplexity
Best for: sourcing starting points (material types, industry guides) with citations to verify.
Weak at: final engineering judgment.