Addendum: Love the flexibility of this new iso format.
3rd party burners:
Etcher - one handy thing about it is that after a burn, it verifies it, unlike most other utils that merely write. This can catch flaky / counterfeit drives at times. So even if you don't plan to use it regularly, it can be a diagnostic tool.
Rufus - (always use the latest) - has the option of putting a persistence partition on the same stick. Works fine with dCore. But to do so, make sure you use gpt and not mbr. And of course the dd method when prompted. The partition is even labeled "persistence" and shows up nicely when you hover with the mount tool. Oh, calculates md5's or sha's too on your iso file. Handy.
I suppose more advanced users could always shrink the existing dCore partition with say gparted, and create another one for persistence of their own choosing later if they want if they don't want to use Rufus' persistence partitioner. Whatever, do your own thing.
I'm old-school, and use dCore / TC on it's own physical device, and my tce directory on another physically different filesystem, but thought I'd bring that Rufus thing up.
I moved my boot and data sticks from machine to machine (Intel NUC's, inexpensive hockey-puck mini-pc's, my Acer laptop, and dCore never had a problem finding the data device holding tce. Well, it did once, but all I had to do was use the standard dCore util, like tce-setdrive, or bang it out manually with UUID's, or simply just specifying the LABEL of my drive. Usual stuff - not a problem.
So I'm pretty stoked at the flexibility that focal iso brings to the table.