The Wrong or Right Choice.

Why would it be wrong? Evolve to your hearts content unless you have a better source for them unevolved. Now, investing dust may be a separate discussion.

"Wrong"? What do you mean by that? If I'm understanding you right, I'd just say there is no right/wrong choice about it. If you can and you want to, go for it. Only reason I'm not really touching my Quilava raid bosses is because the Typhlosion movesets are just "eh" in my opinion.

I've done 2 Quilava raids just to get one with high IV's, but mine were only 78% and 80% IV's, so celebrate your good luck and evolve away. Congrats!

Quilava Raids are there because Cyndaquil does Not Hatch from Eggs. It's the best way to get high iv of the species. So the right thing to do is to catch It and evolve it. I can't understand what would be the wrong thing to do here.

I think you'll have a hard time finding people who think it's wrong to evolve Raid Bosses. If you wanted to stick with your "keep all Raid Boss rewards" rule for a while just think of it this way: you still kept it; you just evolved it.