Wow! What a wonderful unexpected opportunity. I love it when things just fall in place like that! One, if not both, were meant for you.
If both are an option, and they let you (because on the one bag rule) I would get both! They are both very special unique bags. I have the iridescent white 19 small, and it is stunning! It has a slight grayish cast to it, not as white as my 20b irredentist white medium. But the way the irredentist colors shift in the light, is just beautiful. There had never been a 19 in a color like that, so I knew I had to have it. It’s definitely a casual bag, in my own personal opinion.
I have not seen, in person, the new 21s white iridescent. Looks really pretty. Most are saying it’s more of a pearl sheen than a true iridescent. My 20b iridescent white goes with everything, and I actually love wearing it casually. Definitely can be dressed up or down. I think this 21s will be very similar in how often you will actually find opportunities to wear. Definitely looks like one that will look good casual but dress up too.
If only one is an option, go with your gut! Of course we want them all, right? But you know what one speaks to you the most... sparkles and shines just a little bit more in your eyes. That’s the one, just trust your feelings.
Thank you for such a detailed response. I was able to picture both bags and how I’d utilize and wear them. Thinking about how beautiful the classic iridescent is and knowing myself I will be less inclined to wear it because I’ll want to keep it as pristine as possible. This helps me justify getting both as the 19 will be a more casual bag that I won’t be too anal about wearing.