I’ve tried Things, ToDoist, RTM and I keep coming back to OmniFocus (if you think Things 3 is expensive, be ready for a sharp intake of breath). I create new items either via the desktop quick entry, via email or via my watch (a quick hey siri remind me to “…”, or tapping if I wake up at night and don’t want to wake my wife or kids, phone charges downstairs). OmniFocus just sucks in reminders into its inbox.