New to bikes — vintage or modern? Which is the better deal?

I’m in the need of a bike for commutes for up to 10 miles daily but usually shorter. The roads where I’ll most often use my bike are relatively flat, but there most likely will be times where I’d want to use it in a more hilly area on paved roads and bike paths. I live in Illinois where the winds and winters are harsh. I’ve been looking at Treks, specifically the 2019 FX 7.1, however I came across a touring bike during my search.

I found a 2019 Trek 7.1 up for sale for $250. It's basically brand new according to the seller, with a kryptonite u-lock included.

The vintage touring bike is a 1985 Trek 500 for $185. The seller states that the bike is in excellent shape and has been well-stored over the years. Minimal paint damage and no damage to the frame. What’s attracting me to this bike over the newer FX is its steel frame and drop bars. Here is what’s stated in the listing: “Vintage 1985 Trek 500. Double-butted Reynolds steel frame. Touring bike with 12 speed Cyclone components, Royal Compe brakes, SR AXC-100 crank, Avocet saddle.”

I’m relatively new to bikes (ridden before but never really paid attention to quality or specs) so I’m not sure if it’s a good idea to go for an older bike vs a new one. Which would be the smartest buy?