For chenille body jigs, I use collarless. For crappie sized hair jigs, mainly kiptail, I use the same collarless jigs. For larger bucktail jigs, say 1/4 - 1+ oz. jigs, I use a collared hot lips jig. It gives you a bigger profile and lets the hair flare out. I do not use standard 'barbed' jigs though, like you would use for soft plastics. It just gets in the way and is too much trouble to cut or sand off when you can just pick up the pack next to it that doesn't have a collar. If it's a chenille body jig you're tying, it'll also make the body uneven.