I switched from the 8Plus to the 13PM, so see it as a similar jump.
The 13PM is nice, battery is excellent, cameras do overprocess a lot, Macro feature does not work really well. Go to 0,9x Zoom to use it reliantly. If you are into photography, choose the 13P or 13PM. In Europe the 14P are very expensive. Take a refurbished 13P or 13PM and you are happy. Honestly, expected the jump from the 8+ to 13PM to be more spectacular. It is not. The time for this is over. So the 15 or 16 will not be this spectacular and remember, if you choose not to chase the latest and greatest, the jump after that will be bigger
choose what fits your need best. For me, it is the 512GB storage, XDR Display and 120Hz. For camera, if felt like a step sideways not fwrd.
The 13PM is nice, battery is excellent, cameras do overprocess a lot, Macro feature does not work really well. Go to 0,9x Zoom to use it reliantly. If you are into photography, choose the 13P or 13PM. In Europe the 14P are very expensive. Take a refurbished 13P or 13PM and you are happy. Honestly, expected the jump from the 8+ to 13PM to be more spectacular. It is not. The time for this is over. So the 15 or 16 will not be this spectacular and remember, if you choose not to chase the latest and greatest, the jump after that will be bigger