School Rumble, Natsu no Arashi! Recommendations
The series are from the same Mangaka.
If you like the humor go for it. School Rumble however doesn't have much of a story, but NNA does. Other than that, they don't have too much in common.
You like (romantic) school comedies? Then watch SR!
There are also a lot of School Rumble cameos in NNA ;)
Both have a strong sense of comedy and beautiful female leads, both can be surprinsingly serious and touching, both take place in a classic japanese city.
The second anime adapted from a work by Jin Kobayashi, the mangaka behind School Rumble. Natsu no Arashi features much of the same style of quirky humor as School Rumble, as well as charming characters and a fun story. Keep an eye out for School Rumble cameos/easter eggs as well!