+1, QFT! The end rip has only one advantage that I can see. If you get to within 2" to 4" from the ground if standing on end, you can easily hand split the log the rest of the way. Hand splitting on end is a little easier for me than from the side because otherwise the log rolls around.Ripping from the side is much faster and friendlier to the equipment and user, than from the end.
However, I hate sawdust so I usually rip cut sideways when I have to. Regardless, my gut feeling is that I can cross buck saw all day and the chain stays sharp almost to the end. If I rip cut that same amount of wood, especially from the end grain, I doubt the edge would remain that way. To be sure, I have not bothered to test this theory.