First and foremost they are easier to recharge.
While camping connect to a charger limited to 14.4 volts. When amperage drops to zero. They or it, is properly recharged.
With a standard battery, it is guesswork to use voltmeters and ammeters to know for sure your battery is completely recharged. And since many people act like touching a hydrometer is poison ivy good luck with defeating sulfation. People expressed horror at the thought of removing a cell cap and seeing if the cell is bubbling slightly when charged enough. No charger on the face of the earth can be trusted to recharge batteries correctly when wilderness camping. Like relying on a faith healer. Can you get a measly 200 full cycles never mind the advertised 500 cycles out of a pair of golf car batteries?. Especially warehouse cheapies.
My forensic audit of the cost of selling off brand golf car batteries versus Trojan made a major battery wholesaler drop everything else but Trojan. But they didn't cost an arm and both legs 25 years ago.