The timings are the important things once one is into the details. "Logic Circuits" as it's called in many institution is not taught from the standpoint of circuit design for real-world implementation. What's more, one can hardly get most of the old "74xx" series logic. (when was the last time you saw a 74xx133, or a 74xx148, ...) Programmable logic is the current "thing" and costs less, is faster, etc.

Old habits die hard, though, and using a 74xx00 as a negative logic OR when we still, in our minds' eye, see that "dot" on the output of a NAND gate, is a difficult thing. If you draw it as an OR with the two bubbles on its inputs rather than as an AND with a bubble on its output, it's more clear in terms of logic, but not in terms of what you used. Now that it's all programmable logic, all that matters is the function, which should be easy to create either way.

RE