They're all about the same. If you got along well with the calcium/calcium Voyager battery you're going to love conventional lead antimony batteries. Be aware that the Voyager by design requires less watering so that is why it is a sealed design. Doesn't mean it is a better battery, merely that it acts different. Normally calcium/calcium construction makes for a terrible cyclable battery but an excellent standby battery.
If a battery weighs the same as other competitive batteries the battery has as much lead. Wal-Mart batteries weigh exactly the same as other Johnson Controls batteries. No matter what, charge your new battery before dumping it into a boat that is not connected to a maintenance charger.