With the thumb safety. To me it's the best combination of readiness and safety. Easier to draw and sweep the safety with one hand than to rack the slide.
"It's what you learn after you know it all that counts."
If you can't be a good example, then you'll just have to be a horrible warning.
My 9mm and 40cal are without the thumb safety but my new 45 has it. I like the thumb safety better....
Two 45s are better than one!