Hickory is strong and resilient but compared to black locust it is prone to splintering and splitting.
When I was young, I was helping an uncle who was a fisherman off the coast of Massachusetts replace the taftrail, or cockpit coaming on his scalloper, That piece of 2 inch thick Black Locust was original to boat and at least 15 years old at the time. Every time the trawls were pulled up, the lines, chain and chain link parts were drawn up over that rail. Figure all that wear, 5 to 10 times a day, many many days a year, and the board still came off in one piece tapered to a knife edge but still solid. His mooring bit was a 6 inch square piece of black locust that still looked new after being used all the time to moor the boat.
I have a 3 foot chunk of black locust that is left over from that replacement work. It just has a feel to it.