Lately, most of the people who use comparisons between the flu and coronavirus do it in a way that minimizes the impact of the coronavirus so that people take it lightly. To borrow your analogy, they use sedans (flu) and tricycles (coronavirus) in that they say that the seasonal flu kills more people (and it did up until a couple weeks ago). This does not give a true idea what the relationship between them is.

When most people think of the flu, they think of food poisoning where they puke for 24 hours and then are fine. The reality is that coronavirus spreads faster than the flu, no one has immunity to the coronavirus, the coronavirus puts 5% to 20% of the people who get it into the hospital compared to the flu, kills 10x more people who get compared to the flu, without extreme measure will kill ~40x more people than the flu this year, with extreme measures will kill 2-3x as many people as the flu, and doesn't have any proven treatments.

So in short, honest comparisons put the two things in context (eg, coronavirus has the potential to kill 40x as many people as the flu; coronavirus is 10x as deadly as the flu; coronavirus is more likely to put people in the hospital than the flu; the only proven coronavirus treatment is wait until people have double pneumonia and then put them in the ICU on a breathing machine).