Those labels are not final.
Top ranked = Most players
Most popular = Most new playersright.Overall, Aigis is the #3 most popular game on Nutaku in the past three months. It slipped briefly in February to #4
iirc my order was Everlasting Summer -> PPS/AS (due to ad)-> Aigis/LoV -> OI (and so on in the order they were released)
Frankly speaking if not for the lack of events, I reckon Aigis should have the highest player retention for all nutaku games atm.