Which setting gives the most detail?
Braille dots. Each character holds a 2 by 4 grid of dots, so it shows eight times as many points as one letter per spot. Simple and Detailed use ordinary keyboard characters, which paste anywhere.
Why does my ASCII art look stretched when I paste it?
ASCII art needs a monospaced font, where every character is the same width, such as Consolas, Courier or the code style in chat apps. In a normal font the lines have different lengths. In Discord or Slack, put the art between three backticks.
Does the color version copy with its colors?
No. Copied text is plain characters, since text has no color of its own. To keep the colors, download the PNG.
What width should I use?
60 to 100 characters suits a chat message or a code comment. Wider art shows more detail but needs a small font or a wide screen to look right.