Spool or biscuit trans Xmember?

The only one that failed on me was a very old non spool mount type in my 1970 340 duster street strip car. The rubber was old and probably oil soaked. The trans did not break completely free as there is some fail safe to the mount design even in the non spool type. But the trans was moving around for sure. Given the choice, the spool mount would be the one for me.