The Sig P290 vs Sig P238 is a Sig on Sig comparison between the .380 ACP and 9mm pistol options.
The Sig Sauer P290 9mm pistol is part of the micro 9 concealed carry movement and the Sig Sauer P238 .380 ACP pistol is part of the original pocket pistol movement. I am not sure if the pressure of people wanting a more powerful round or the fact that .380 ACP was nearly impossible to get during the pocket pistol explosion drove companies into the micro 9 market. Regardless of the motives we are sure glad they are showing up.
The two Sig Sauer options are very similar in size with only fractions of an inch separating them. They are both offered in multiple configurations, which you can learn more about at Sig Sauer’s website.
Sig Sauer Website