FW 6 might be better for ease of use though, being regulated with temp levels you can set*. The standard LB is unregulated which means the heater is on as long as you hold the button down, and you can overheat and combust with it if you don’t know what you’re doing.
If you can handle the learning curve though, either one should be easy enough to use. LB might be more of an issue if you hand it to someone else who doesn’t know how to use it though.
The Li’l Bud Elite or Timber Elite would be a couple of many other good options, but they’re a little less pocketable.
*setting them is not as easy as some since all input is done by squeezing the device to engage the button, but actually using it should be more fool proof