I have used many different methods to write hybrid ISOs to USBs over the years. I guess I am one of the lucky ones who have NOT run into problems when, using PUPs/DOGs, creating either bootable DVDs or bootable USBs.
I have used the dd commands prescribed by PUP forum members; I have used Etcher; I have used the utility that Barry Kauler presents, ... I have etc.
In reviewing "USBImager", I find that product woofully missing the objective: "Ease of USE!". Performance wise, it doesn't seem to be any real improvement versus the other methods.
On EASE OF USE, it is astoundingly missing the point and I would never give/present it to any inexperienced user. Just because it is small does NOT make a good useful applicaition. The friendliness for something like this is far more a requirement for safe succesful use versus small.
It lacks help, it lacks fields help, it lacks obvious options in plain sight without clicks, it lacks field labels, it lacks ... It may have been done in a rush or it may have been done for the developer's personal use only.
Here's a picture of it (tried on FossaPUP64 and Slacko64)

- Etcher is Better.jpg (9.32 KiB) Viewed 2408 times
You be the judge for what is best to use. For me using any LInux distro, I use 'dd' or Barry's or Etcher for USBs and PBurn (Puppy multimedia utility) for DVDs/CDs.