Hmm this is tricky. I use color changing for work . Subtle change in color like a natural brown with a slightly enlarging diameter for example Olens Cherry Moon Series and Olens Glowy Natural Series but for shopping/ going out / special event i go for dramatic eye color change a good recommendation is Olens Smoky series and Olens Nella Collection

They're both just preferences! If you like the look of enlarging contacts, you can search for contacts with a bigger graphic diameter out of a specific color you'd like. Personally, I look more towards enlarging, but I make sure that it's a color I want as well.