RxSwift: Bind to button taps

RxSwiftBindToButton.swift

import UIKit
import RxSwift
import RxCocoa

let button = UIButton()
button.rx.tap.bind {
    print("button tapped")
}

cool!

Simple and cool. But I think the disposed-by is missing:

button.rx.tap
    .bind {
        print("button tapped")
    }
    .disposed(by: someDisposeBag)

Dont know the difference but Im used to do this way:

btnSend.rx.tap.subscribe(onNext: { [ weak self ] in
self?.showLoader()
self?.viewModel.updatePassword(success: {
self?.hideLoader()
self?.navigationController?.popToRootViewController(animated: true)
}) { (message, highlight) in
self?.hideLoader()
self?.showErrorAlert(message: message)
}
}).disposed(by: viewModel.bag)

Which is the better way?

Using bind is better way because tap is a ControlEvent<()>, so it never emits an error. In case of using subscribe, it's not obvious anymore.