Baseball bats typically hit very hard. However, the impact on the audience doesn't always leave a favorable impression.
See what I did there? OK, my point is not to buy into all the magic marketing lingo. Really, nobody would market an effect saying "Puts them to sleep" "Bores them like they've never been bored before..."
Our job is to entertain. Tricks don't entertain, magicians do. Think about that for a couple of minutes.
Asking other people for this sort of advice, without anything else, is like askng them to tell you what clothes you should buy to wear next Friday. I can tell you what I would wear, but I'm pretty sure that black dress pants and a french blue button down oxford with black dress shoes wouldn't necesarily work for you.
Each of us gravatates toward certain effects and presentations. I like classic magic with meaningful presentations. I like to use quality props that give off a sense of professionalism. I like my magic to have a unique feel to it, to be different than anything else people have seen. That being said, I could take any effect and make it a closer. How? Through scripting the presentation of the effect to make it entertaining beyond merely doing a "trick."
Ultimately, the best closer is you.