I'll share what I've experienced (so far). I quit cigarettes and started vaping just a little over 3 months ago. I first tried a cig-a-like and didn't care for it. Then I went to a vapor store here in town and talked to the folks there. I explained as best as I could what I wanted, with my ultimate goal to be tobacco free. One of the guys told me about the Kangertech EMOW kit. It's a pen type like the ones you've asked about. The kit comes with one battery, a charger, tank, and a 5-pack of coils. When fully charged, the battery lasts about 8 hours. It's a manual battery, and the only thing I might complain about is that the button is flush with the battery. I wish it was raised slightly to make it easier to find at night, especially when driving. There are lots of e-liquids on the market to choose from, as I'm sure you've started to discover. The vg/pg ratio can vary, typically either 50/50 or 70/30. I've found that a 70/30 ratio works best for me. With that ratio, a coil will last for about 5 days. With a 50/50 ratio, I'm lucky to get 3 days out of a coil. Keep in mind, this applies specifically to the Kangertech. Results could be different for a different brand. Also, the resistance of the coil makes a difference. I've found that a 1.8 ohm coil gives me much better results than a 1.5 ohm coil. Since I don't have any experience with the ones you've mentioned, I don't know if you have a choice in coils or not. If you do, I would recommend the 1.8 coils. Overall, I don't think there's a real huge difference in the different brands of eGo type batteries. I would definitely stay from cheap knock-offs, especially like the ones you'll see on eBay. Also, it's a good idea to buy two batteries. That way, you can always keep one charged up while you're using the other. I'm sorry I couldn't answer your question directly, but I hope I've been able to give you some helpful information.