These are why Screech is better then Steve Urkel.
While they are both nerds who are romantically obsessed with a lead girl (Lisa Turtle/Laura Winslow), and would try various methods to get a date with them, Screech showed more self-control and restraint while Steve would go from annoying to desperate.
Screech never barged into the Turtle's home or followed Lisa everywhere she went; while Steve always did, and bordered on the line of stalking.
While they both used pet names even though they did not date, Screech would reluctantly accept Lisa going out with someone else while Steve would follow Laura on her dates and crash them, and whine that she should date him, and go nutty when she would go out with others. Screech did go nutty when Lisa and Zack fell for each other.
Screech eventually let go of his crush on Lisa and accepted being her friend only; Steve never did, and only did so after getting a taste of his own medicine from Myra and eventually began dating her.