Ivory is the only way to go.........
Every cue-maker's joint will play differently. It's not because of drastric differences in the joint. It's due to all the other variables such as ferrule composition, tip hardness, shaft diameter, taper length, age & grain of the wood used for the shafts, the balance point, and of course, the type of cue joint. My Mottey cue was made in 10/'91 and the joint and ferrules (both ivory) are like new. An ivory won't crack or chip unless the cue was abused, dropped or improperly stored.
Personally, I prefer a flat faced ivory joint with wood face shafts that my Tim Scruggs cue has. My Mottey cue has a piloted ivory joint and the feel plays much differently than my Scruggs cue but both are incredible to play with. My Runde Schon has a 5/16x14 steel joint and let me tell you after switching to ivory joints, when I play with my Schon I don't like the feel. It has no sensitivity or feel and it's balanced for a forward roll versus the Scruggs cue which has a neutral balance feel to it. In other words, I drive the cue ball based upon the energy of my stroke and I can feel the difference from a short stun shot of 2-3" tangent line roll, to a 5 diamonds draw stroke or a tough rail cue shot.
Ivory isn't for everyone but the best legenday cue-makers used ivory joints for their most special of cues. If you make the switch, you'll never go back to a steel or phenolic joint. If you get to play much with an ivory joint cue, presuming of course the cue meets you weight preferences etc., you come to dislike playing with your steel joint quickly.
The bottomline is I'll never buy another steel joint cue regardless of whom the cue-maker is and I've just selected a cue-maker to custom build me a cue (18.5 ozs) with an radial pin, flat-faced ivory joint. And yes, all of the ivory being used to make my cue is pre-ban elephant ivory.