You are correct, it comes down to which one you like better and suits your planned loudout better. These are going to both be very similar in terms of gearbox internals and quality of construction. In both cases, you've got all-Taiwan-made AEGs which very likely have the same gearbox and motor, and the differences are mostly just dressing.
I personally recommend the SR-16, we're only talking about a lunch or two worth of dollar cost between the two and it is quite nice.
If you're in the GTA, you can pick the SR16 in person and make a personal connection with the guys at Mach1, who are FAR more likely to give you friendly helping hand with this gun than the guys at Hero, who have a rather bad reputation on this forum and do not specialize in airsoft. Go with the SR
