I do not know if it's available on iOS (I suspect no) but on Android I am a really happy user of Osmand. It uses Openstreetmap as maps provider and I always use it when hiking. It gives you the altitude profile of your route which is very useful.
2. Disable map features like areas, buildings and such
3. If still unhappy, delete the full blown map data and download the road only map data (about ⅓ size of full blown map)
4. eMMC/microSD speed matters a lot, if you put it on an external SD card, make sure to get a high speed IOPS card labeled "A1" (1500) or better "A2" (4000 guaranteed read IOPs).
Reason: The map is rendered locally on demand from the map data(base), there's no tiles in the default map view. You basically get almost all of Openstreetmap's data (POIs, buildings, areas, ways and relations), not every poi type is indexed and searchable though. It even have has a working public transport map with routing based on timetables (if present) and ferry ways, etc. If you put the data on a slow external sd card, you'll notice.
Edit: I realised after posting this that you were actually referring to releases not performance.
A usable alternative to gmaps for me.
OSM maps will include store and venue locations, but Google Maps will show me their opening hours and give me their phone number, website, and (for restaurants) menu and food pictures.
Looking up that kind of info is, [i]by far[/i], the most common reason for me to open the maps app in the first place, before I actually decide that I want to go there and start navigation.
Obviously this is all information that Google has and OSM doesn't. But I would be OK with a plugin that lets me click on a store on OSM to open it in a Google Maps page in a webview.
I'd be letting Google know that I am interested in that place - no way around it - but I could keep the information of whether I actually went there and how long I stayed within OSM, without sharing my location with Google.
Another, probably easier plugin would be one that lets OSMAnd recognize the location provided by Google Maps when I use the share button. Then I could look up places I want to go on GMaps and send them to OSMAnd+ for navigation.
Entered data will be added as a note to OSM and experienced editors will then correct/add the business on the map.
Google invests a lot into tagging google map POIs. On standard Android installations Google maps activates the maps timeline recording for you and it's creepily good at guessing to which shops you've been and by what means, etc. You then get frequent notifications that push and nudge you to review and answer questions about places (wheelchair access, confirm opening hours, business type, inventory, add photos, reviews, etc). The whole ordeal is quite gamified with contributor level and stars earned on your profile badge. It's designed to have GMaps' data as much as possible enriched by users.