Unetbootin has three advantages from my point of view:
1) I'm familiar with it2) Using it, one can create space in order to use the usb stick as a portable, i.e. I can save files on the stick for later use
3) It's quite straightforward and stable (not 100% though)It seems that the 'Startup Disk Creator' of Trisquel allows for additional space up to 1 GB (according to https://trisquel.info/en/wiki/how-create-liveusb)
Does the dd-way create extra space?