I think most people use 3. 3.5 makes the coils to flimsy.I use 3mm
But that's me.
If you like 3mm stick with it.
I think most people use 3. 3.5 makes the coils to flimsy.
I tried them both with fused claptons. I didnt see a difference in vapor.That really depends on the coil and some of the more elaborate coil builds are much easier to wick at 3.5 than 3mm. I primarily use 3.5 to get a little extra coil in there to up the resistance and add to the coil mass for cloud chasing. You would be amazed sometime at what difference a couple of mm of wire makes in the final output of vapor production and resistance. Especially with the more elaborate coils.
Try them both and see what happens. That is really the only way to know for sure which one you like more.