List of parsers to compare: gson 2.8.0, jackson 2.0.1, moshi 1.4.0, ason 1.1.0.
pros: fasters, triggers GC least, most customazible
cons: 6.7k methods (can be reduced by Proguard), API not so friendly
pros: fast enough, most popular (10k stars on github), pretty API, small
cons: relatively slow, trigger GC relatively more
There is no reasons for me to use moshi or ason based on this comparation: they are slower almost in each test.