Is your ceremony in a different location than your reception?
If so, consider the time it takes to get between Venue A and B. There are more logistics involved here, but easily can be overcome with smart planning!
Every venue has a capacity limit. Depending on your guests count and the style you're going for, you might want something larger for more room to mix, mingle, and dance. Or, maybe you want a more intimate occasion. A few things to consider would be: you do not want a HUGE venue that makes your guest count look even smaller, and you also do not want people crammed into a space with no where to sit or stand.