My biggest kink is maintaining good communication: if you respond to message/inquiry after 4 days, I have probably already booked with someone else.
Half joking. But, honestly, depends on the day and my mood. And the provider.
Some days I want light domination. Some days vanilla. Some days want to try this, some days want to try that.
I find that the best provider is the one you keep seeing on a regular basis and is willing to try new things with you, and build a special relationship.
Also I find that many providers mistakenly thing that a client is interested in only one thing (because that’s what he mentioned the first time you met them), when in fact he might be interested in many things, depending on the day and time. And trying different things keeps things more entertaining: sometimes you never knew you liked something until the provider actually does it without you even asking.