What's your go to drink when you go to the bar and why?

My favorite drink is usually a crisp white wine like Pinot Grigio but I’ll order a Sazerac or Old Fashioned (or a specialty cocktail) at nice places. At a dive bar or music venue or whatever, I typically stick to gin and tonic or vodka soda, the main reasons being just that they’re simple for a busy bartender to make and also don’t make me as miserable the next day.