I found that the PG juices made me cough, but the VG juices feel quit smooth, you might consider ordering some of that & letting both your spouses try those.
Ditto!!
VG is generally milder, maybe a bit sweeter. PG proved irritating to my throat and lungs. I developed such a sore throat and actually pain in my lungs...that may have been part of the cleansing after smoking, but I switched to Vegetable Glycerine with absolutely no further problem, haven't tried PG again since then. Don't want to ruin a good thing.
I am a HUGE fan of ECOpure, I DIY
strictly with Krystal and Mixer. My opinion it's the most consistant, I don't add additional water to it for my Formula Recipe, 801 carts (larger, not as big as the Mega) and it's the perfect viscosity. Manufactured to highest standard I believe.
I would love to try the EGOMega system. What Cozz said about the bigger carts is true, they are a little more prone to flooding and wicking problems, but workable with some patience.