Difference between BowkerLINK and MyIdentifiers?

Arpeggio

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Can anyone tell me the difference between the two? As far as I can tell they are different portals into the same thing. I find BowkerLINK poorly made and difficult to use e.g. uploaded covers don't show so you can't tell what the current one is or whether one was uploaded at all. I find MyIdentifiers a little better but it seems you can't add ISBNs to it, you have to go through BowkerLINK to do that first.

Can anyone tell me what the difference between the two is and why both are still needed (wouldn't one be enough?)