GoPro Cineform code...and a few related questions

I've been learning Resolve since I'd prefer to use it for several reasons...However, I still feel there are some things that are easier to do in Premier until Resolve gets them worked out, and so I've been trying to do most of the work in Resolve, export the video, then import that it into Premier Pro for the extras. I did a lot of searching and reading and, for my part, looking at all the formats and codecs that would yield the most across-the-board compatibility with the highest quality (but practical in size), it seemed to me that an AVI file with GoPro Cineform codec would be a good choice. But...
What I've found is that Premier Pro does not import AVI's with the GoPro Cineform codec. It does take MOV files that way, but for some reason, it can't handle the avi/cineform combo. Furthermore, Adobe is dropping support for the Quicktime 7 era formats, which I presume means eventually the MOV format may fall by the wayside. I saw the comments about DNxHD being a good codec, though I think that was also Quicktime (which is fine but then why has there been such a big deal about the GoPro Cineform codec now being supported everywhere?) It's all pretty confusing to me.
So, my question then is, would anyone like to offer advice on whether the AVI format -is- a great choice, or not. And, if it is then what other codec would be widely compatible across platforms? If not, is Quicktime/MOV still the way to go, until something really changes?
Along with that, what formats & codec(s) are most commonly used in the industry for deliverables (such that I'd be safe saving my original work that way knowing I can reduce the quality for online if need be, but still crank out a high-quality version if and when I need one)?
Thanks...
What I've found is that Premier Pro does not import AVI's with the GoPro Cineform codec. It does take MOV files that way, but for some reason, it can't handle the avi/cineform combo. Furthermore, Adobe is dropping support for the Quicktime 7 era formats, which I presume means eventually the MOV format may fall by the wayside. I saw the comments about DNxHD being a good codec, though I think that was also Quicktime (which is fine but then why has there been such a big deal about the GoPro Cineform codec now being supported everywhere?) It's all pretty confusing to me.
So, my question then is, would anyone like to offer advice on whether the AVI format -is- a great choice, or not. And, if it is then what other codec would be widely compatible across platforms? If not, is Quicktime/MOV still the way to go, until something really changes?
Along with that, what formats & codec(s) are most commonly used in the industry for deliverables (such that I'd be safe saving my original work that way knowing I can reduce the quality for online if need be, but still crank out a high-quality version if and when I need one)?
Thanks...