It's hard to pinpoint a single 'strongest stand' in Jojo manga. Different stands have unique abilities and advantages. For example, The World has the power to stop time, which gives it a significant edge in many situations.
A new Sun fanfic can catch attention when it offers a new take on the existing universe, has compelling dialogue, and creates a sense of excitement and mystery. Good pacing and emotional resonance with readers also play a big role.
One way to find good 'jojo and sun oh love alarm fanfiction' is to join relevant fan groups on social media platforms. Fans in those groups might share their favorite fanfictions or even write some themselves. You could also ask in those groups if anyone has any recommendations for this specific pairing.
The JoJo manga is mainly in black and white. Colored versions exist but are not the norm. Sometimes, colored illustrations are done for promotional purposes or by fans.