Ask Lemmygrad

GrapheneOS is definitely great. It doesn't support faceID however. I don't know how much you need it for other apps, but if you just need it for security, it's a completely unreliable technology. A password/pin is much stronger. With faceID, someone can unlock your phone with a simple photo, or even while you sleep. I've seen police use faceID to unlock people's phones when the people deny to unlock it for them, by just pointing it at their faces.

Apple's faceID is actually a bit more secure, because iPhones have extra sensors to recognize when the phone is being fooled by a photo. Google-based faceID is just based on the camera, so very easy to fool.

On the other hand, GrapheneOS has much better permission settings, which can provide much stricter or looser control on individual apps, which is a much more significant security feature than Apple or Google OS.

If none of this is practical for you, then you basically have no choice but to go Android. Although technically you could have a device for your banking needs on Android, and a device for personal use on Graphene. I've also heard it's possible to turn some android phones into dual booting devices (running both OS and switching between then 2 by restarting the phone), but I've never seen it done.

You don't have to stick to Google's Android OS though. There's CalyxOS which is open source and free (for the most part). It's still Google-based, but it gives you the possibility to get rid of the most serious Google spyware/adware, and has better security options. No FaceID here either.

LineageOS is also a pretty good alternative to Graphene, but I hear it's less functional (but more user-friendly to install). Still, you can set it up to connect to Google services, which would enable you to run any Android app probably. By default gets rid of all of Google's spyware/adware. Also no faceID.

A pricier (and perhaps riskier) option is to get a Fairphone device, which is a completely de-googled phone, fully repairable, and its OS is compatible with almost any Android app (and also able to run iOS apps). The only catch is that your service provider might not actually work with that phone for some reason. I've heard this is a particular problem in the US. I don't understand why this problem exists.

For your laptop, I'd recommend Arch Linux if you are a beginner. It's got a similar UI to the standard OS (Windows, Mac), it has extra features to enhance usability for people not familiar with Linux systems, and it's got great support for running Android apps natively on your PC. However, it doesn't come in 1 package. You will need to get the base OS, and then you install add-ons to it, depending on your needs. So it will take some time to research and then set up.

If you want an all-in-one package and don't mind about flexibility then Ubuntu is the way to go for beginners. It's real easy to learn and use, and it has similar features to Arch (but just takes a bit more effort to set up anything not natively built in). If your work involves coding and you know your way around Linux, then I'd recommend a more advanced build, like Red Hat.