Example pathway: Super-Pathway of glycolysis, pyruvate dehydrogenase, TCA, and glyoxylate bypass
MetaCyc has an order of magnitude more information integrated into it than most wall charts. Plus, you can get true interactive metabolic overview maps, where you can click on the enzymes and compounds (example from the E. coli database):
(be sure to zoom in and click on things!)
The Pathway Tools software, and the metabolic networks, are freely available for academic use, and you can use it to construct your own metabolic networks.
Full disclosure: I'm a former full-time bioinformaticist on the project.
If you need the full pathway map, you can see them e.g.:
There's also a lot that's not on either map, like specialized secondary metabolite synthesis pathways (although kegg has select secondary pathways).
I agree with you regarding their mutual incompleteness. There's plenty more literature to curate! See my systematic omparison of KEGG and MetaCyc for more details:
>For life science research only. Not for use in diagnostic procedures.