You are so kind.
Empreinte is also heavily coated these days (wasn't the case 10 years ago), so that should also be similarly carefree. Maybe a little less, since it is softer, but still very hard wearing. To be honest, I don't have any personal experience with Empreinte, I never bought anything from that line, I just hate that leather. It's just a personal preference, since goes against all the design rules I judge things by. But if people enjoy it, I am glad. I'd still rather buy Empreinte than Michael Kors or even a Chanel Caviar.
On the other hand, as you already know, I very much love Épi, that is a very distinctive and honest leather. The lightest one I own is Rose Ballerine. That is VERY light, not Quartz level, but quite. I never had issues with colour getting onto it from jeans or other clothes. I did put an LV Initials keychain (from the Men's line) onto it as a bag charm. It is palladium coated, and as it dangles around while I walk, it does leave a mark after a while. As I was ligthly using a graphite pencil on the leather. But fortunately it does come off just like a pencil, it easily wipes away with a baby wipe. I am team 'everything-free baby wipe' when it comes to cleaning, and in most cases it was more than enough. I haven't worn it crossbody a lot, also not with very dark jeans, those might be an issue. But if you'll use it hand held, it's gonna be fine. No need to worry about hand oils. If you wipe it every month, that would be enough I guess.
The Nano Alma is gorgeous. The Quartz is the most sophisticated colour. The Fuchsia is indeed a little loud, not as easy to wear. (If I should choose colour, I'd go with Lilas Provence or Vert Noto. Those colours are just amazing, they remind me of the great colours the iPhone 12 had. They nailed them, big time.) So between those two I'd recommend you to go with the Quartz, that is an excellent colour.