This one. Look, reminiscing about the past is nice an all. Indeed, professionally I spend most of my time in the 17th and 18th centuries, but "the good old days" is largely selective memory. This is especially true for women - you, as a gender, had virtually no rights before the 1850s and were largely considered nothing more than a cook and a baby maker until as late as 30 years ago. Living in any time before mechanization would have involved backbreaking labor from a very early age, and a particularly unpleasant death.
But my main reason for not wanting to go back: disease. We didn't even understand what germs were until the late 1800s. Plagues and famine killed millions, and were blamed on witches and the Jews. Doing demographic studies even in the early 1900s is depressing work.
Finally, consider this: It is estimated that a teenager with access to the internet absorbs more information in a single day as most people did before 1800 in their entire lives.
So if you're going to go back in time, get your shots and bring a gun.