Are two houses on two lots better than a duplex

[Diane Trotter]

I checked into what I thought was two on a lot in Little Rock, AR:  6618 and 6630 West 30th Street.   It looks like they are two separate lots though I'm not sure. The selling realtor said she had another property I should consider.  It turned out to be a "bundle" or two houses next to each other.

1.  What are implications for maintenance, taxes, insurance?

2.  Are there other issues I'm not listing?