Are you mainly studying the market as a homeowner, or considering another purchase? That changes what would be useful. For a first-purchase question, mortgage comparisons and a jurisdiction-specific legal checklist may come before investment modelling. If this is general market tracking...
Ask every lender for figures based on the same loan amount, deposit, term and repayment basis, dated as closely together as possible. I’d also request written answers on partial overpayments, full early repayment, portability and what happens when the one-year fix ends. Comparing like with like...