JESSIE LAISIMO

Everybody prefers what they like, I have heard that the SS coils have a cleaner taste, and don't require a break in period. I do know that Kangers new round coils for their Subtanks are going to be SS. I am waiting to get some 28g SS416L in vape mail, and will find out if I like SS.

I will have to check it out.  I am just not much on dual 18650 mods.  I really prefer a smallish mod.  The ipvD2 is just about perfect, but I am really liking the NEBOX.  I wish they would improve it a bit, and re release it.  A bit more airflow, and a little better programming, clean up the machining, and this would be my dream rig.  I may try to drill out the RBA to get a bit more airflow.  The SSOCC coils have much better airflow.  I was thinking of getting a D3, but I just can't justify it.

I prefer simplicity at its finest. The closest thing to a box mod that I have and currently love is an Eleaf iStick 50W. The batteries are not changeable, it's simple, and it just works. It's variable wattage and variable voltage, I can sub-ohm if I want (I usually prefer to stick to around 1.8 ohm for coil resistance whether I build it myself or buy a premade coil), it has enough oomph to be very versatile. Best of both worlds. 

I'm a huge fan of the ipv d2. Been using it for the last few months and it's been great. I swap my thundercloud rda or the tank by the vapors on there and it's a really smooth build. Also works well with the cloud champ plus and and aspire triton and the praxis tank as well. Huge fan. Again, like earthling mentioned - battery type is very important. I'm extremely paranoid when it comes to some things and vaping certainly is at the top of the list. I'm a huge fan of the snow wolf mini and the sigelei 75w is my latest pickup. But as far as size. The ipv wins hands down when it comes to size, button "clickiness", and adaptability. Enjoy!

Ni200 is pure nickel. NICR is Nichrome which is a alloy, at least that's how I see it. Ni200 is used for temperature control and Nichrome is usually used in wattage mode. 

Yep, what Earthling said. Plus, just because it's popular doesn't mean that it's the right one for you. Vaping is very subjective, only you will know which one works best for what you want. 

Hello Jessie, and welcome to VT!
Popular?  Why just the selection between those two?  To me, neither are overly appealing, but the choice you make will be based on price, functions, size/feel, button-placement, and features (floating/adjustable pin, materials, color, etc.).
You'll find that many of us here may agree that a particular device may suit the needs of the masses, but we also agree there is no "popular" or "must-have" device that everyone should own.  What you should use, is based on your preferences and needs... not necessarily what is popular
Also, I'll add... the battery you use in the device is very important... safety first!  There are lots of recent threads with the pros and cons of different batteries and suggestions for some of the current, best-on-the-market 18650's