I mean the obvious solution would be to offer both, but I understand that’s file space on your servers.
The way I see it, you have two segments of client base, which I will (slightly incorrectly) parse as “Studio” and “Indie.”
“Studio” users are preparing work for television/film work and are the most likely to be using high end cinema cameras, shoot RAW, and really need the grading flexibility of LOG footage. These are your working artists who have to get the look right as their job. (I used to be in this group)
“Indie” users are, of course, everyone else. The vlogger/hobbiest/group of aspiring friends making films for fun. There’s usually no money involved and include the people who think it’s ridiculous that their VFX heavy, 5 minute short might take a few hours to render. This group, in general, is very interested in working fast, because no money is involved and they want to finish so they can go catch up on Netflix.(No insult intended, I’m in this group)
Studio guys absolutely want LOG most of the time. Indies will want REC. 709 most of the time, and many (most) aren’t familiar with LOG and might wonder why everything is so flat looking?
So, having both download options available caters to both groups. Of course that’s using extra server space at the ActionVFX end.
The cold-and-logical answer is to follow the money. Are you making most of your income from Studio or Indie users? ActionVFX is a great group of people who want to make reasonably priced, high quality elements available to all, but it’s still a business and you have to make money to live, keep your office, shoot more elements and storefront what you have. Catering to the market segment buying the most makes sense on paper.
But, of course, ActionVFX is a company with heart, and that calculus of income is cold. Now the, “heart” thing to do is provide the highest quality files - LOG - and make sure you kick out some tutorials on coloring.
As someone who bridges between Studio and Indie users I’d take the LOG. At minimum I could save a preset to the Curves effect of my software to expand your LOG elements to full (rec 709) range. Now I have a drag and drop preset to set me up for the next grading steps…
I guess that’s a long post to vote for LOG?
A wildcard option might, MIGHT, be to offer REC 709 on the storefront, but LOG on the drive. It’s going to be Studio users buying drives, and they’re the ones most likely to want LOG. I have no idea on how much extra effort that requires at the ACTIONVFX end, but it’s a thought.