I have a PD and a TT. Here is what I think about the two:
PD hits are tastier BUT I get less hits. (ie: PD I get 3 milky and then 2 not so great compared to TT with like 4-5 milky and then 1-2 not as great.)
TT hits can be as tasty as a PD, BUT you need to control the temp by not placing the tube all the way in and slowly place it in further as you progress in hits.
I can definitely milk my TT a lot more then my PD, but that is because it is a higher temp, and by higher temp I have to say I have uneven burned bowls. I almost always get a darker brown spot in the center of my TT bowls. Whereas with my PD my ABV is almost ALWAYS the same color all the way around.
Additionally, since the TT is running hotter, its hotter in the hand. Definitely a difference it outside temperature compared to the PD. I am also not a fan of the stand, it just awkward having to place it in it. I like how with the PD I can just get it down wherever. I also thinks this avoids a stealth factor. Someone is more inclined to ask what is that over my PD.
But in all cases, I have been using my TT more, and my guess is because it is newer and I really do like the hotter temps for helping me sleep. When you break it all down its all personal preference. If you want a hotter hit and to get the most out of your material then look at the TT, it has just a slightly higher learning curve with the higher temp. If you want to keep everything at the perfect temperature without really having to fiddle around then I would look at the PD/ZAP/WDZ.
Oh and I forgot, the TT does have the bowls and heat exchanger that unscrew. Definitely a nice extra feature, but again its still just an extra feature, not as much of a deciding factor to make me choose one over the other.
*EDIT* I didnt even realize you were comparing an EPIC VAPE to this all as well. I own this too, and I dont know if I really classify it as the same type of "Log" vape. It may be made out of wood, but it hits much different then the traditional vapes. Not sure how to compare it really, but if you have any more questions Ill asnwer them the best I can.