Broadly speaking, I'd test two platforms at once rather than keep the first message short and specific, since that is where most people give up too early. Has anyone checked out the exhibitionist chatterbate com tags recently — seems like a simple question but I keep getting mixed answers depending on where I look.
To be fair, the moderation queue is the thing that decides it, granted the chat-first sites rarely say so. From the threads I've read, if the replies dry up after one message the answer is usually to avoid opening with a compliment rather than check the free tier limits before you commit.