I'd rather use nero cdburnerxp or infrarecorder, you can do the safe thing, choose the lowest burning speed
You can use pretty much any burning program so long as it's capable of burning a .iso to disk. I've head repeatedly to burn at slowest rate but have yet to see pervasive evidence that's the best approach. Of course some burns fail, but my experience is that's usually because of either bad or cheap disks. For many years I've burned at the highest rate and set the program to verify the burn with great success. But, as is the usual case, your mileage may vary. I prefer Imgburn, but again that's a personal choice. It's free and it has worked well lo these many years.
ms recommends that on the iso dl page, also there's less chance of reading failures and more compatibility
The mct and the iso dl page will probably use the same burn engine as the built-in image burn app from windows, the burn speed was important back in the far past, and mostly for dvd video or mp3 cd's for car/portable audio
why lowest and not highest ? Answer is " Data is digital and CD/DVD is physical analog. One of the reasons that cause your drive to burn slow allof a sudden is Windows will turn off DMA mode for a burner after encounteringerrors during data transfer operations. If more than six DMA transfer timeoutoccur, Windows will turn off DMA and use only PIO mode on that device. Normally 4X speed is safe burn speed."
No and right now neither for computers that cannot boot from pen drives, most can't boot off them and you have to use a DVD
Without a reference to the source and its validity, the "answer" is little more than opinion. And even then, one person's answer may be another person's dilemma. The real "answer" is what works for you. Technology changes rapidly and to stick with yesterday's solutions for today's situations is often not a wise choice.