Actually, higher current ESCs generally tend to have mosfets with lower RDS on resistance and will parallel more of these on the pcb than lower amperage ESCs. For example the Hobbywing just stock uses a mosfet with an RDS on of 1.1mΩ. While the XR10 Pro G2 has mosfets with an RDS on of 0.6mΩ. When you combine theses in parallel you drop that resistance even more. Mind you, these resistances are at 25°C, as the mosfets heat up from that resistance, the values increase. Ultimately, a 160A ESC will have a lower RDS on because they have to be better at dealing with heat than the lower current ESCs. When it comes down to it, the limiting factor is how well the ESC deals with heat. Even the Just Stock esc has mosfets that are capable of well over the specified ESC rating. But it can't deal with high currents because it can't dissipate the heat generated by the high currents due to a higher RDS on resistance. So yes, there will be a difference in blinky going with a higher current ESC even though you will not hit the current limits. The question isn't is there a difference though. The question is whether or not you are a good enough driver to notice the difference, because it isn't going to be much. You know the saying, tap the board once and the advantage is gone...