Yea, the 3389 has higher granularity, but that is it's only positive feature. I and numerous other people in the past have noticed the AM010 is a more responsive sensor than the latest and greatest from Pixart. Logitech and other companies should be attempting to refine and improve upon the AM010 branch and give up their current trajectories. I've tried the 3327 (which people claim is some sort of evolution of the AM010) in the Corsair M55, and while something about Corsair's implementation is a little rough around the edges, you can tell the potential is there and would probably be a lot better in a Logitech mouse.
The M55's concave sides making it uncomfortable to hold is a different story and why I don't use it, but as soon as someone releases a good shape with an evolved AM010 sensor whether it's the 3327 or something else, I think you'll see people start switching off the 3360/3389 line. Both the AM010 and 3327 feel very similar in responsiveness to each other and a bit more raw in nature like an MLT04, while the 3389 doesn't seem to have the hair trigger response and is also starting to get into the realm of the cursor movement feeling entirely synthetic in nature.
People were trying to claim the AM010 feels twitchier due to being a low FPS sensor, but apparently that is not the reason:
Originally Posted by qsxcv
i dont think am010 feels the way it does because of fps. 3366 which has comparable fps up to ~0.75m/s feels considerably smoother than am010 even at low speeds
This QVC dude tries to sell it as a positive for the 3366, but it's not. All he's really saying is the 3366 is taking your input and overly cooking it making it too synthetic. I realize sensors have to filter out some 'noise' or clip values outside a certain range to prevent jitter, but the further they go trying to make things like jitter completely impossible by clamping all your input into a narrow band, the further they make sensors feel absolutely nothing like how they should feel - like an MLT04.
Maybe this could be solved by forcing Pixart to remove the two frames of interpolation/smoothing/whatever you want to call it they put on these 3360/3389 sensors, but I have no idea if the sensor tracking implodes for some reason without it. I hear there was a zero frames interpolation G303 firmware, but I don't have a G303 so never tried it. I'm guessing all of their anti-jitter "technology" relies on interpolating these two frames and if they didn't do that, they would only be able to raise DPI to like 3000 and want to try and fool people with one million DPI marketing gimmicks instead.