Samsung released three phones in the S23 range, the standard Samsung Galaxy S22, the Galaxy S22 Plus, and the Galaxy S23 Ultra. The same models exist with the previous Samsung Galaxy S22 and S21 series too.
The Galaxy S23 Plus is only slightly bigger than the standard S23, with a 6.6” display, but smaller than the S23 Ultra which has a 6.8” screen. The camera system is exactly the same for both the S22 and S22 Plus, aside from the 30x Digital Zoom you get with the Plus model.
A major difference between the standard and Plus is also the battery life, with the S22 Plus boasting 4700mAh,  and the standard S22 only having 3900mAh of battery power. The dimensions however are exactly the same, but the S23 + weighs more than the S23 at 195g compared with 167g.
The Galaxy S23 Ultra however is undeniably the favourite child, with a bigger and better display, camera system including a 200MP main camera, improved resolution, 5,000mAh built-in battery power, and built-in support for the S pen making it a catch for creatives.