I’ve been using both for a bit now and still couldn’t decide on which one is better. The multiplayer feature I’m looking for is the match making system with tier/rank. I’m also making a game for IOS mobile.
Matchmaking is a paid service from Unity, and for Fishnet you‘d have to go look for a service that works with Fishnet (can‘t say whether Unity‘s services are compatible).
This chart might help: Updated! Free networking solution comparison chart.
That reminds me, I’ve been meaning to add these to the chart. FishNet does support the Unity transport and services. We’re also preferred by Hathora. They have hosting, matchmaking, and a lot more.
As the creator of FishNet that’s where my vote goes! Our product exceeds others in performance, features, and arguably stability. We have a very friendly and helpful community as well.