The comic Flash typically has more established feats of speed compared to the DCEU version. However, different versions and story arcs can sometimes make the comparison less straightforward.
Barry could use his super - speed to quickly track down Zoom's lair. Once he locates it, he might try to create a distraction to draw Zoom away from Caitlin, allowing other members of Team Flash, like Cisco or Wells, to sneak in and free her. Cisco could use his powers to open up portals or disable any security measures that Zoom has set up.
Zoom could be kidnapping Caitlin simply out of his twisted sense of power and control. He enjoys causing chaos and fear, and taking someone important to Barry like Caitlin is a way to assert his dominance. Also, in the context of fanfiction, the writer might be exploring a scenario where Zoom has some personal vendetta against Caitlin that was not fully explored in the original series. For example, he could blame her for something that happened in his past, even if it's a misdirected blame.
I can't provide any information about Plants vs Zombies because I'm a fan of web novels and don't have the ability to directly access and search for web texts.
One of the best stories is when Flash has to outwit Captain Cold's new ice - based weaponry. Flash uses his super - speed to create heat friction and melt the ice. It shows the classic battle of speed against cold power.