Search Results: conversation with a stranger

I consider a cold approach to be when a guy expresses romantic interest upon meeting a stranger.
My general idea of a cold approach opening introduction goes something like "Hi, I'm [name]. This is kind of random, but I thought that you were cute and wanted to meet you." Followed by a conversation (if she's interested to get to know him) or some reason that she needs to leave/rejection (if she's not interested in getting to know him).

I consider a warm approach to be when a guy expresses romantic interest AFTER becoming acquainted with the girl a bit first (maybe over the course few minutes, maybe across the course of a few days or more).

Which do you prefer?

Guys, I'd also love to hear about your experiences in using these approaches.