I highly recommend variable voltage as opposed to straight 5 v. You can get a variable voltage box at madvapes for a reasonable price. With vv you can dial it up or down to match your atomizer or mood and you'll get a lot more use out of it. I have 3.7, 5v, and vv. I use my vv daily, rarely use my 5v, and go back to my 3.2 and 3.7s for dual coil cartos that don't work well at higher voltages. Big bonus to vv is that I already had 20+ atomizers in varous ohms that I can match voltages to. Otherwise I would have been looking to replace them all. I purchased 15 attys that were suppose to be 5 lr, 5 rr, and 5 hv. They all turned out to be rr. So if I get an atomizer that is suppose to be something its not, I can compensate with vv. If you're already satisfied with 3.7 then I can't think of any advantage other than to satisfy your curiosity. However, if you were looking for stronger throat it, shorter draws, flavor change then there would be advantage.