Short answer: It depends on your travel style, but the hop-on hop-off bus is a convenient and easy way to see the highlights of Buenos Aires in one or two days. There are two companies: the Yellow Bus (Buenos Aires Bus) runs every 20 minutes, goes through Palermo Soho and has live tracking. It’s my favorite. The Red Bus (GrayLine) runs every 30 minutes and passes El Monumental, the River Plate stadium. A 24-hour ticket…