When comparing Keybase vs Line, the Slant community recommends Keybase for most people. In the question“What is the best chat software?” Keybase is ranked 21st while Line is ranked 23rd.
Ranked in these QuestionsQuestion Ranking
Pros
Pro e2e encrypted team chat
Pro Can share files with persons & teams e2e encrypted
Pro Not tied to your phone number
Pro Can host encrypted git repositories with teams
Pro Large celebrity and public figure usage rate
The caveat is that they are in Japan, but the app is commonly used to 'follow' public figures.
Pro Enormous, constantly updated stamp collection
Since many brands use stamps for promotional purposes, everything from movies to food brands to Taylor Swift have released stamp collections.
Pro Photo filter and editing capabilities
Users have in-app editing tools, as well as Line's separate camera application, which has additional tools.
Pro Integrated social network
Similar to Facebook's timeline.
Cons
Con Server is Closed source
Con Not for everyone
Normally people don't know about encryption, nor should they. Niche audience means less value as a messenger app.
Con Account is locked to the Phone Number & Device
The entire account is locked to the phone number, which cannot be changed. If the application is installed on a new device with the same phone number, the previous account data will be wiped.
Con Users have been concentrated in Japan
Of the 360+ million registered users, the top country is Japan (50 million). Thailand and Indonesia are 2nd and 3rd with 33 and 30 million, respectively, with very small market penetration in the US (10 million, 11th place).