More advanced tools such as CFD allow experimenting with different bow geometries. A protruding bulbous bow was, for a long time, the easiest way to reduce open water resistance.

In case of cargo ships, many of those new bow forms are designed for lower service speeds where the bulbous bow in fact has a negative effect on the open water resistance (added wetted surface -> increased frictional resistance).

As seen on the link given by Henning : there is a bulbous on the Aidaprima https://image.stern.de/6333318/16x9-1200-675/b6fa9ccf989273a2d71877e0721bcb76/ol/aida-prima-dock.jpg

There is a confusion here for many people about the bulbous as not all ships have protruding bulbous forward of the ship - some bulbous are integrated with the hull especially if over the waterline the bow is vertical. It's the case for the Aidaprima and it's a similar scheme for the Celebrity Edge

Then about vertical bow vs splay bow it's another discussion, a boat with a vertical bow will be softer in the waves but it will raise more sea spray

New bulker https://www.marinetraffic.com/en/ais/details/ships/shipid:3657999/mmsi:374814000/vessel:KAGUYA

http://www.shipspotting.com/gallery/photo.php?lid=2729642

https://boards.cruisecritic.com/showthread.php?p=53339487
The full picture :-)

That might be right or may be not :-) Aidaprima with the "same" bow design has no bulbous bow under the waterline, at least not in the classical sense. I found a pic overhere https://image.stern.de/6333318/16x9-1200-675/b6fa9ccf989273a2d71877e0721bcb76/ol/aida-prima-dock.jpg An my guess is the the edge also only have an "edge" in front.

Modern day ship design still include the bulbous bow. It never went away! In reply to csaba's earlier comment and I'm no marine architect, but after doing a cursory check of some on line sites there is no apparent tangible advantage of the vertical bow vs the bulb. The vertical design as some site info suggests, tend to cause less stress & strain on a ship's hull as it slices through rough seas. A bulbous bow modifies the way water flows around the hull, reducing drag, increasing speed range, fuel efficiency and stability.

There is a mistake when saying "in a few years somebody will invent the bulbous bow again" it's also a mistake to compare vertical bow against the bulb" as there is a bulbous on this bow - not seen on the pics just under the waterline

The bow is not really vertical . Looks like a "dreadnought" style . Ugly look .

In a few years somebody will invent the bulbous bow again :-)
probably for the same reason as last time :-)

What could be the advantage of the vertical bow against the bulb?

Angle photo taken illustrates the "vertical bow design" which others in the industry have incorporated in their design (i.e. AIDACruises/NCL). This design seems to be making a comeback in shipping world. (Bulkers/AHTS vessels).