What's more addiciting.. Methadone or Methamphetamine?

I just need to know which is more addictive. I believe methamphetamine is more addictive than methadone.

I've done both in the past. I didn't feel hardly anything off of methadone unless i mixed it w/ other pills.. which is dangerous I know.

But I'm just needing to prove a point..

Yes I know methadone is an opioid.

A friend of mine has a methadone addiction.. and I just can't understand how.

: http://alcoholdrugstreatment.info/whats-more-addiciting-methadone-or-methamphetamine