For DSLRs, Nikon’s F-mount will give you a lens catalog dating back to the 60s if that’s your criteria for choosing Canon. Unmotorized F-mount glass does require buying either a D7xxx or FF body if you want autofocus though.
In the mirrorless world, if you’re on a budget E-mount is probably the way to go. Other than M43, it’s one of the oldest mirrorless mounts and is also completely open, which gives you plenty of third party lens options.