How do I compare FGP and SGN on lead time to Finland?

Concretely: FGP · SGN · Finland.

I suspect the honest answer is that it depends, in which case I would like to know on what.

Assume I can obtain either option without difficulty, so availability is not the deciding factor.

Under what conditions does the answer flip?

Answering this needs the axis. A supplier that is best on paperwork and a supplier that is best on price are both correct answers to different questions.

Cost per milligram of actual peptide is the honest price comparison, which means dividing by measured content rather than by label claim.

More usefully, publish the method with the result. A comparison without the laboratory named and the submission dates given is not reproducible by anyone.

The caveat is that a comparison is a snapshot of the lots compared, and lots change.

Price per milligram of measured peptide, not per milligram of label claim.

In practice, ratings on this site are ours alone and are deliberately not reconciled with anyone else's.

Submitting to different laboratories introduces a method difference that commonly exceeds the supplier difference. Gradient slope alone can move a reported purity figure by a per cent in either direction.

To compare properly: order the same compound at the same nominal strength from each supplier, submit all samples to the same laboratory in the same submission if possible, and ask for the same test set on each.

Content assay results across the published datasets vary considerably more between suppliers than purity does, which makes content the more discriminating axis.

Name the laboratory and the dates or the comparison cannot be reproduced.