When comparing Endomondo vs MAPS.ME, the Slant community recommends MAPS.ME for most people. In the question“What is the best gps app for bicyclists for navigating on iOS?” MAPS.ME is ranked 2nd while Endomondo is ranked 4th. The most important reason people chose MAPS.ME is:
That saves a lot of download, e.g. from ~500MB in other applications it is reduced to ~50MB for German surroundings.
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Pros
Pro Can use data from accessories (Paid Feature)
For those that subscribe to the monthly fee to unlock extra features, you can use data from heart-rate sensors and pedometers.
Pro Motivates by giving optional challenges
Endomondo allows competing with others or setting and reaching personal goals. Winners of challenges get prizes.
Pro Analyzes performance
Performance analysis can be viewed on Endomondo's homepage after a workout.
Pro Generous free version
All the necessary features for a basic fitness app can be used without getting the Premium version.
Pro No need for an Internet connection
Once downloaded an Internet connection is not required, except for social features.
Pro Social features
Show routes of other people nearby. You can issues challenges to your friends, record a motivational speech for them and view their progress.
Pro Tracks distance, duration, avg. speed, avg. pace, calories burned and hydration
Endomondo displays your route using Google Maps and tracks distance, duration, avg. speed, avg. pace, calories burned and hydration. It even tracks what music you listen to while exercising (can be viewed on their website).
Pro Has motivational audio messages
Endomondo can interact with you via audio messages giving reports on progress and encouragement.
Pro Very detailed selection of areas to download
That saves a lot of download, e.g. from ~500MB in other applications it is reduced to ~50MB for German surroundings.

Pro Includes offline routing and turn-by-turn navigation
Users without a data connection can still use the app for turn by turn directions, which is great for those that travel or use a device that does not have a cellular data connection.
Pro Obtains data from community-based OpenStreetMap
MAPS.ME uses data from OpenStreetMap, meaning the data retrieved from that service is a community-based map. Anyone can freely edit and contribute to the map, a map concept that is similar to Wikipedia.
Pro Fast rendering
By using compression of the map data, MAPS.ME is able to speed up the rendering of their maps to one's device. This allows for a quicker feeling app.
Pro Optionally can download traffic information
And showing it color-coded (Google-maps-like) on the streets.
Pro Discover nearby feature
Shows a nicely organize list of interesting places to visit close to your current location.

Pro Matching modern material-like interface
The design of the app uses a material-like interface making for a close to native looking experience on Android.
Pro Offline vector maps
Automatically downloads vector maps for offline use.
Pro No nagging advertisements
Pro Easy to install
Pro Easy adding/editing of bookmarks/favorite places
Click on the map and you will have the option to Bookmark, Route From, Route To. Having selected Bookmark simply offers to edit it, e.g. give it a different name.
Pro Allows to edit OpenStreetMap data
It is possible to add new and edit existing POIs in OpenStreetMap database using a nice interface.
Pro Night mode
There is a night mode option.
Pro Integration with booking.com
Displays information from booking.com about hotels and apartments.
Cons
Con Removed features from paying customers in the past
Endomondo used to be a singular priced upfront paid app with no subscription fee, twice. During the first restructuring, the app was changed on the store, leaving out the people who had paid originally, to then require them to pay again for the new app. After this happened, the app changed again to be free-to-play, dropping features that paying customers had paid for and locking them behind a monthly pay wall. So not only did long time users who paid for the app get ripped off once, if they had paid for the newer paid app, they got ripped off again when the app went free-to-play. This is not a great track record for the service, leaving to question, when is the next restructuring going to happen that may potentially take the money of paying customers without delivering the service promised.
Con History Manage
If for some reason you activity gets duplicated, you have to go one by one to delete them, since there is no bulk erase.
Con Features locked behind paywall
Many features of the app are locked behind a monthly or yearly paywall. A single month subscription is $5.99, while the yearly subscription is $29.99. This may be prohibiting for those that want to track exercise, but do not want to commit to the cost.
Con Works only on outdoor activities
Indoor activities can be logged manually, but the app is created to track outdoor activities.
Con Poor response time to recalculate the route
Con No option for satellite/aerial/topographic imagery
Not as useful for navigating while hiking/climbing/etc.
Con Very slow search and route calculation
Probably because MAPS.ME has more POIs in its database which ends up with all searches and route calculations being very slow.
Con No display of speed limit
Neither the next nor the current one.
Con No way to distinguish between fastest, efficient or shortest route
Con Very limited options
E.g. no way to hide certain buttons like the traffic button, or to configure the language used to display city names.
Con Sometimes very strange suggestions
E.g. when not using the suggested route, Maps&Me continues to request to turn even if you are more than 100m after the cross-road.
Con Favorites are a little bit too hidden
Because they are stored in groups.
Con Traffic information is not available in all countries and cities
Source of traffic info is a trade secret this feature is only available to some selected cities.
Con No lane assist
Con Being based on OpenStreetMap data can be lacking
The use of OSM also has the drawback of many places not getting the attention needed for updates. Depending on the geographic location OSM may have the most detailed maps or the most bare/outdated map.
Con Does not show images offline
Does not show images offline if supplied in standard kmz file. i.e. zipped kml plus image folder.
Con No tourist detail maps
