Well it's a hard pick so I will choose one for each category
For close-up - ACR, the first heavy slights effect I have learned and still my favorite simply because I can improvise with it, I have about 8-9 stages in my head and I just pick a few and mix them to create a different effect every time.
For stand up (street and parties) - once it was an effect I did that is a bit like the ending of the Copperfield/James floating rose routine that I did to ladies, but now my favorite is a routine I call "Voodoo connection" which is basically a 2 stage routine using a smoker. First stage is my take on Garcia's "Warning" (only I learned it from a book I got off Amazon for 3$

), in the second stage I either do a version of Luke Jermay's "PK lipstick" or just a simple ash to palm effect, depends on the mood. Get gasps every single time.
For stage- Snow storm in china, I have no Idea why, but I'm just in love with this simple effect. Every time I perform it, especially with the right tune I get an amazing adrenalin rush that I just can't explain.