emacs mode-specific custom key bindings: local-set-key vs define-key

Question

After a few years customizing my .emacs file, I find I used two different kinds of constructs to setup major-mode-specific key bindings:

1.

Answer 1

I have lots of custom keyboard commands and I couldn't bother with various ways to set them in Emacs and all these keymaps overriding each other, so I just installed John Wiegley's bind-key as per my relevant answer.

(require 'bind-key)
(bind-key "C-l" 'goto-line)