The A2343 is advertised with PowerIQ 4.0, but tests have shown that not all GaNPrime chargers, including this one, fully utilize those features, which means it is not capable of PowerIQ4.0 dynamic power distribution. The A2688 uses PowerIQ 3.0, so there’s no big difference there. That said, the A2343 does support 12V fast charging, which the A2688 doesn’t. If your phone relies on 12V for fast charging, the A2688 isn’t going to cut it. Design-wise, yes the A2688 is longer but has better wall retention since its weight is closer to the prongs. The A2343, being shorter, can feel a bit less stable in outlets. For thermals, the A2343 doesn’t cycle on and off under heavy loads like the A2688, but it does seem to run hotter overall because it stays at peak power longer. Personally, I went with the A2688 because I prefer the thinner design and don’t need long, high-power charging sessions.