As Ray says, a lot of it is down to personal preference. We all get better results with materials we are comfortable with. Having said that, as Dave states, its also horses for courses. The framework for a Huntsman or Swordsman kit would not work well with 1.5mm ply as it would be too flexible so you would need to use the much heavier 3mm or more ply. Skinning with 1.5mm ply would be OK but as it is thinner you would need to be more precise in fitting. Liteply gives you a bit more wriggle room and is easier to sand in.
Here I will make a confession! When building the Swordsman kit I did press a bit hard at one point and snapped the keel – oh joy! But i just gave the ragged break a squirt of Superphatic glue, straightened it up and within an hour you couldn't see the join.
For the boats I usually build Litelpy is not very suitable but for the two Faireys, although it was a new material for me, I thought it went well with the constructional design and was very happy with th finished result although this was also due to the CNC parts being very accurate and fitting together well. I have built a lot of review kits in my time and these two were the most satisfying in many ways although I struggled a bit with the painting which is purely down to me and nothing to do with the kit.
As far as Epoxy vs Eze Cote covering is concerned I was bamboozled by Dave as in his original Huntsman instructions he specified Aerocote rather than Aeropoxy. So I ended up with filling the cloth grain with a very hard fuel proofer which was a so and so to sand down although I got there in the end.
On the Swordsman I used Eze Cote and while it is obviously not as hard as a finishing epoxy I found it quite adequate and pleasant to use. Again, personal preference. It did the job.
For my current project, a 1903 liner, I am looking at going back to my roots and using gumstrip paper tape to simulate the hull plating. On previous models I used diluted Cascamite to wet the gumstrip and apply it and may do the same again. But I also have a test piece using water based Eze Cote to apply the gumstrip. The advantage of gumstrip is that when it dries out it contracts very slightly and offers a very smooth surface for final finishing. So I like the old ways which I know work but am happy to experiment with new materials as well. All part of the fun really.
Colin