Between a seacock and an inline ball valve?
A seacock is a valve between the 'sea' and the non sea
Sorry for the pun but is is a passage way from the water side to the dry side and unlike a thru hull, has a valve. Now that valve may be a ball valve but it could be other types also. A sea cock is usually a 'one' piece unit in the sense that there is a hard (no hose) connection between the through portion and the valve.
A ball valve is a type of valve. You can have a ball valve connected by hoses on both ends or a ball valve built into another fitting.
So simply stated, a seacock defines more of an application whereas a ball valve defines a type of valve
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