The short version
Same Therabody ecosystem. PRO Plus adds 60 lbs stall force + OLED display. Elite delivers the same 16 mm amplitude + same warranty + same app at $200 less.
When PRO Plus is the right pick
If you need 60 lbs stall force for deep-tissue protocols or you want OLED pressure feedback display — PRO Plus is the right shape.
When Elite is the right pick
If you want the full Therabody ecosystem and 16 mm amplitude without paying for stall-force ceiling you don't need — Elite is the right shape. The rational Therabody buy.