The folks at Swifting.io wrote a blog post about iOS software architectures. The comparison of VIPER and Clean Swift/VIP is very interesting: the VIP approach favors uni-directional flow, which I like very much. The article is worth a read for that alone!

They falsely consider MVC and MVVM to be software architecture approaches, though, and too point out that MVVM and MVC suffer from similar drawbacks.