I prefer the Verado. I have a 2017 200 Verado Pro myself. Quick answer for me = VERADO.
With the newer Verado, the thing that stands out most to me is the alternator amp/wat output is much better on the Verado. If you will have a lot of power draw for accessories or future add ons, that is a very nice feature on the Verado compared to the 4S. This alone would be a difference maker for me.
The 4S gives options on type of steering (hydraulic or power) and controls system (mechanical or digital), where the Verado has baked in top tier of both without options: power steering and digital controls DTS only.
In my mind power assist steering and digital controls are the only way to go; especially with Mercuries systems. So I like them baked in automatically with the Verado’s. Mercuries digital control system and DTS throttle are awesome!!!
You also have a slightly different gear case ratio between them: Verado 1.85:1 v 4S 1.75:1 I believe this is what helps give the Verado a better hole shot and acceleration compared to the 4S when proped properly. I believe this impacts torq, rpm range, and prop pitch options. That said, this is NOT my area of expertise. Others in here can speak better to the impact of this difference.
For me the alternator output increase on Verado is a big selling point. And since I really like the power steering and the Mercury digital controls and DTS system, I would be adding them anyway with the 4S anyway. Hence, I might as well have it baked in with the Verado.