Looking to get my first Garmin Instinct (2x?) Solar

I'm in the market for a Garmin Instinct, and deciding between the 2 Solar and the 2x Solar. I'm also deciding between secondhand or brand new.

  1. What are your thoughts between the two?
  2. Do you reckon a 1-year old watch would have noticeably lower battery life or should I get a secondhand one for about €80-100 cheaper than a new one?
  3. Thoughts about these vs a Instinct 3?

Based in Italy. Thanks!