Hello friend,
So i think both photos look good. However I like the non flash photo better. I personally use both because i never know what kind of photos I'll want to use, but I've noticed that when using the flash most of the time it ends up making the buds look almost white or silver, this may be because the flash over exposes parts of the subject matter, but i love being able to see the true colors of the plant and that happens best with no flash.
One thing that can help is light up the room with natural or white/yellow lighting and then when you take the photos without the flash you can avoid it being so dark. I also think everyone should get a mini tripod that can hold a camera or a phone because it can help eliminate the tendency to get blurry photos while not using the flash.
I guess that's the main reason I use the flash is because it tends to steady and focus the image better and reduce blurring.
Keep trying new things, sunlight, lamps, backgrounds(poster boards work great) and just keep on clicking. I usually get 1 out of 100 photos that i really love. Lol
Happy growing.