2. Which features of the three products you guess are most appealing to you?
1. Wondervape RDA - Nothing particularly appealing, but an OK-ish RDA. The bottom airflow is a very strange solution for an RDA, and the fact it's not adjustable make it even worse. Further, if the well is filled even slightly more, it's bound to leak if not hold strictly upright.
2. Captain PD1865 - The Captain PD270 is an most excellent mod. This one should be essentially the same, so it's just as appealing. But why IJOY made it is rather puzzling. Was it worth making another model just for the tiny size difference, about 4mm in height & width ??? The 18650 battery sleeve was a hassle for someone ???
3. Captain PD1865 with Wondervape RDA - Combining those two and selling them as a kit is a marketing solution chosen by IJOY. Maybe the far better part (the mod) will help selling the lesser part (the tank). Appealing for the mod, very much so, the tank being an inevitable burden.