^ I do like the idea of readers getting more insight into Draco, Crabbe, and Goyle if Harry had chosen to become friends with Draco. That said, I could also see Draco only wanting Harry as a friend in the loosest sense of the word. He may have been more interested in having Harry by his side because of Harry's popularity and reputation.

Draco could also have tried to influence Harry, mostly when it came to Voldemort and the beliefs surrounding him. However, I really do think that Harry's moral compass would have probably been too strong for him to be influenced forever. Once he began to understand just how extreme some of those beliefs were, I could see him eventually questioning them. Probably even finding his way to Ron and Hermione.

So, overall, I don't think Harry and Draco would have developed a particularly strong friendship. It could have been interesting to learn all about it, yes, but I think there would have been plenty of cracks in that 'friendship' that could have eventually caused it to fall apart.