Is it just me or does the so called "Defult comps" of these two maps is basically the same as the defult ascent comp
Jett
Omen
Sova
Kayo
Cypher (Could be KJ)
There are two default comps for Sunset: the first is Raze, Gekko, Breach, Omen, and Cypher, and the second is the comp you're referring to but with Neon instead of Jett.
As for Abyss, that is the most popular comp, but it's not really by a massive margin (frankly it's mainly because DRX was finding success with it). You have as many people playing some variation of the Astra comp or even other things entirely