Choosing checkbox over toggle switch for focus order?

Should I choose a checkbox over a toggle switch due to focus order? I personally prefer Option B because it's less eye catching than A, and I know a toggle switch is a metaphor for turning something on or off, but in this context, I'd like to make the user focus more on the start button since it's the more important and users have to click it to start a program.

My concern is that the toggle switch would draw the user's attention and harm usability.