I have been using /e/OS for 5 years, and also GOS. My take is:

- If your phone is supported by GOS, you should go for GOS.

- If your phone is not supported by GOS, you should look carefully and compare between /e/OS and Stock Android.

I had a Fairphone 3, and after 5 years, /e/OS was outdated by 4 years w.r.t. the manufacturer updates. In other words, Stock Android coming from Fairphone was more secure than /e/OS on that Fairphone.

In my experience, /e/OS has a tendency to claim that they support everything, but they just can't, there is too much. And then they complain when GrapheneOS criticises the fact that some /e/OS users believe their phone is well supported but actually isn't. And GrapheneOS is not wrong: I realised I was in that case after 4 years with /e/OS.

GrapheneOS claims to be a lot more secure, having additional hardening. See https://eylenburg.github.io/android_comparison.htm - keep in mind that it is not an independent comparison, the Graphene guys directly feed what this table is supposed to say in the issue tracker, https://github.com/eylenburg/eylenburg.github.io/issues/. But it gives a good representation of the state of the ROMs according to Graphene.

In regular use, main difference will be that /e/OS comes with access to the alternative cloud service that project provides. It uses the default FOSS solution microG for google api compatibility, unlike GrapheneOS with their sandbox approach. /e/OS sets on AppLounge to install and upgrade both play store or F-Droid apps. Graphene has a small curated app repo instead.

I'd never use GrapheneOS since I don't trust the project. /e/OS is also not my favorite since it feels like it is developing slowly, having had issues with outdated software versions - though it does work well in practice. Have a look at iode for an alternative.

Consider this (by Graphene OS): https://discuss.grapheneos.org/d/24134-devices-lacking-stand...

/e/OS community talking about it: https://community.e.foundation/t/article-from-grapheneos-abo...

And then maybe this: https://eylenburg.github.io/android_comparison.htm

Hope that helps.

GOS creates a complete bunker of a phone that can provide defense against pretty much all but the most dedicated state level actors. If you're worried that someone would steal your phone specifically to target you, Graphene will protect against that. Securitywise it's hard to argue against them, although GOS tends to sacrifice usability in favor of security, which leads to odd decisions. Their device depreciation timeline is also pretty aggressive and really just matches that of the Pixel. (You're also buying the Google phone... to not want Google in your life; this bizarre paradox will always be strange). It's not exactly a recommendation for long-term support. Worth noting however is that usage of GOS is also seen as a signal in and of itself for the authorities that you may have something unsavory to hide, so using it stands out in that regard; some law enforcement officers (I think it was in Spain?) have said that the OS is popular with organized crime. GOS obviously denies the connection and they're probably honest in that the OS isn't deliberately designed for criminals, but it's worth noting at the very least. (Basically GOS is the paradox where someone trying their hardest to be anonymous ends up standing out way too much from the crowd and drawing attention to themselves.)

/e/OS (and similar "non-LineageOS" ROMs really) instead focus more on de-Googling. They're still generally security focused, but the priority is less "someone's after you" and more "corporate surveillance is kinda scary innit". The aim is less to avoid someone actively trying to drain your phone of data and more to prevent your phone from passively sending everything it can possibly find to the Big G's ad machine (as well as whatever other trackers get snuck into apps.) Because of this, they usually have better depreciation timelines and support a lot more devices compared to GOS who only support the Pixel line (which is an increasingly awful set of phones truth be told); their scope is much smaller.

Finally, it's worth noting that the GOS community is absurdly toxic to anyone doing anything privacy-related that isn't under the banner of GOS. It's extremely maximalist, tends to get very upset at other projects whenever they get attention (see sibling reply to this, where they pretty much melted down because an outlet dared to recommend a Fair phone+/e/OS) and the projects official channels have generally encouraged this sort of behavior. It doesn't really damage the software itself, but it's worth considering.

The main difference is that GrapheneOS prioritizes security hardening first and foremost (above usability or compatibility). /e/OS focuses on privacy (i.e. reducing data leakage to adtech) and usability over security.

To put it concretely, GrapheneOS recommends running all the proprietary Google apps in a locked "sandbox" so they can't read data on the phone outside the sandbox -- but obviously Google still gets to see everything you do in their apps. /e/OS tries to provide [largely but not entirely FLOSS] alternatives (e.g. their own Maps app, their own email, their own calendar) that make your phone usable out of the box without Google software.

Read this:

https://eylenburg.github.io/android_comparison.htm

In short, GrapheneOS is vastly superior.