Un-melded HQ craft specific gloves give CP +3 and Control 31.

Fully melded class specific HQ gloves give CP+3, Control +36 and Craftmanship +4.

The Ehcatl gloves give Control +39 and Craftmanship +4 and can be used by any craft class. They cannot be melded.

The debate is whether the loss of +3 CP for a gain of +3 Control for high level stuff is worth it. Personally I'm using the class specific on my LTW ( my only fully melded crafter ) and the Ehcatl on my other classes until I have the time/Gil/desire to make the fully melded gloves for them.