Outside of the major changes of the screen and battery, there’s minor changes in pretty much every area of the OLED. Whether that’s worth it depends. For me, the Deck was my main device, and for that it was completely worth selling the old model and upgrading. If it won’t be your primary gaming device or it will almost always be docked (so not benefiting from the screen or battery), then maybe not. In either case, the power is basically identical and some software changes have been made to massively improve the LCD screen, so you really can’t go wrong.
As time goes on I lean more and more into PC gaming with emulation for older systems. Resistant to hardware and disks/cartridges failing and there are fewer concerns with online functionality going away completely. There’s a lot to like about the Switch but with it being literally their only console that still has any online features, I have serious concerns about longevity.