For a smaller startup (< 10 people), I'd recommend going with a person's email. Bonus points if you use your own.
We do that and get the occasional reply, but when we do, people are usually happy to get a quick, personal response.
Once you're larger, using more purpose-suited emails that route correctly is better (e.g. marketing@example.com or billing@example.com routed to the correct customer service teams).