I have heard from people here that Chanel No. 19 has more of the leather note (vis-a-vis floral) in EDT than EDP, and I personally love the leather note. I can also attest to the potency and longevity of the EDT version -- comparable to most EDPs IMHO. I believe EDP has been discontinued here in the US, so I'm hesitant to invite an attachment to the EDP, as 19 one of my staples. Having said that, I would like to try the EDP for comparison, and would also like to hear what other have to say.
I tried Apres L'Ondee EDT, and the EDT seemed pretty weak to me, compared to 19 and say L'Instant, Champs Elysees or Samsara (ditto Mitsouko). In general Guerlains tend to be more characteristic in the EDP/parfum versions than the EDTs.