@Observable (iOS 17+) vs ObservableObject Comparison

import SwiftUI
import Observation

@Observable
class UserStore {
    var user: User?
    var isLoading = false

    func fetchUser() async {
        isLoading = true
        user = try? await api.getUser()
        isLoading = false
    }
}

struct UserView: View {
    @Bindable var store: UserStore

    var body: some View {
        TextField("Name", text: $store.user.name ?? .constant(""))
    }
}

import SwiftUI
import Combine

class UserStore: ObservableObject {
    @Published var user: User?
    @Published var isLoading = false

    func fetchUser() async {
        await MainActor.run { isLoading = true }
        let fetched = try? await api.getUser()
        await MainActor.run {
            user = fetched
            isLoading = false
        }
    }
}