First of all, NiKo has 8 years of relevancy, ZywOo 5 which is already a huge gap, 3 years of tier-1 CS.
Second of all, NiKo has played at 12 majors, in 2 majors finals with 2 different teams meanwhile ZywOo only 6 and got eliminated at all of them besides Paris, obviously
Third of all, NiKo has : ESL NYC, ELEAGUE PREMIER. IEM Sydney, ESL One Belo Horizonte 2018, BLAST Premier World Final 2022, IEM New York 2020 Europe, IEM Katowice 2023, EPICENTER 2018, ECS Season 4 Finals and two small Blasts
6 of which are very prestigious trophies (ESL, ELEAGUE, BLAST Final, IEM except for NYC online)
ZywOo has : BLAST Paris Major, IEM RIO, ESL PRO, EPICENTER 2019, ECS Season 7 Finals, cs_summit 4, IEM Beijing-Haidian 2020 Europe, BLAST Premier Fall 2020 Finals
Only 3 prestigious trophies. I dont count online IEM Haidian since I didnt count NiKo's IEM NYC online