In case it is of use to others, here's a comparison chart of the software I used on iOS and what I'm now using on /e/.
Where I'm using the same application on both - Element, Signal, Tor Browser etc. - I have not bothered listing it.
I obtained as much as I could from the native /e/ app store, Apps, but I did have to resort to the Aurora Store for some things.
|iOS application||/e/ application||Comments|
|Safari||Firefox||Browser. It makes me wish I'd used Firefox more on iOS|
|Canary Mail||k9 with OpenPGP||Email client, with PGP. (I tried Canary Mail for Android, but their support was lacking, so I gave up.)|
|Tootle||Tusky||Mastodon client (although I'm seeing if Twidere will work for this too|
|I didn't have one||Transistor||Internet radio client|
|Native support||DAVx5||xDAV client, for calender, contacts, and tasks synchronisation|
|Tasks||OpenTasks||Task manager (kept in sync via DAVx5)|
|WireGuard||WireGuard||WireGuard client but, unlike iOS, WireGuard for Android does not support on-demand activation. I'm using the native Android VPN settings to force WireGuard to be always-on, but I want to explore using Tasker for on-demand activation|
Bits where I am struggling.
Jellyfin. It does not work properly if not foregrounded. This includes when the screen is off, which is a pain when listening to things.
Petrol station apps (and possibly others): I've yet to work out why they appear provisioned to access the device's GPS but cannot seem to be able to do so. Which renders them useless.