Boban is an absolute joy to watch. His game is so different from Splitter's, I'm not sure you can say one or the other is better because you'd have to use them so differently. Splitter is a fleet footed big who can switch on pick and rolls, and is also great at rolling to the basket for a layup. Boban uses his strength and size, and is often pushing around other centers like dolls or just turning and shooting over them.
Boban has a solid jumper where Splitter had no shot. Boban can also hit his free throws.
Boban finishes easily on contested shots, where Splitter would frequently throw up a weak layup or get stuffed. Last night Boban stuffed it over two of Philly's bigs under heavy contact (which I thought looked like frustration fouls that could have been considered flagrants) like it was nothing.
I think Boban is a fine defensive rebounder, and also a great offensive rebounder--even while out of position. He reaches over the head of his defender and just tips the ball back out.
Splitter fouls a lot less.
Against a team like the Warriors, Splitter might be better, but I could see situations where Boban could cause some havoc and force the Warriors to change their lineup. I could also see situations where Boban is destroyed by good ball movement and picks.