Coarse vs. Fine Calcium reactor media

[Stones]

Just wondering if anyone could comment on their experience using either the coarse or fine media in their calcium reactors. From the sounds of it, the coarse media is 'suppposed' to use less Co2, prevent channelization, and avoid the build up of the calcium sludge that develops after a few months if using a fine media. However, I've also read that the coarse media actually uses more Co2 and produces less of calcium/alk outuput than does the fine media. Just thought I'd see if anyone had a preference to which media they prefer and why. Thanks.