Hey there, by some amazing coincidence I actually operate those two exact robots for my work producing food art. I’d say there are reasons to consider one over the other beyond payload, I’ll try to summarize here:
Reach: The KR16 opens up worlds of options for moves with its much further wingspan, it also allows for an L-bracket that opens up more moves as well as ease of shooting vertical without having to remount/re-rig your whole camera/fiz rig, vertical might not be important to you but for me I’m shooting 95% vertical for use on 65-85″ TV’s placed vertically throughout a casino. Vertical also has many uses for social media. Also consider your base height, the limited reach of the KR10 will also limit how high and low you can get. Just think of the KR10 as basically the length of a human arm, its very limiting.
Power: The KR10 can be ran off 120VAC, this is huge, I’m considering a KR10 for home use because of the added investment the KR16 requires in power, which is 480VAC 3-phase. You can either pay some big bucks to have that power brought to your building or you’ll need to invest in a step-up transformer (208/220 to 480VAC) and that will either need to be 3-phase or you’ll need to also invest in a rotary phase converter ($1000-3000)
Smoothness: Not as huge of a difference as the previous two, but the KR10 uses belt drives for A5 and A6 and if i recall correctly the KR16 uses no belts. In general the KR16 is smoother than the KR10 when payload calibrations are equal between the two. Granted our KR10 is a few years old and our KR16 is one year old, so maybe thats the reason? Or maybe its because, like you said, we’re closer to the payload max of the KR10 (Phantom VEO4k with full FIZ and an 18-35 PL Lens, about 8-9kg of a rig)
I know this wasn’t a direct answer, but I hope it provides some value in your search for the right robot.