Best Emulators

Torongo said:

I'm looking for a good emulator, and would like the opinion of the SevenForums people. What do you like as far as emulators?

Thanks

~Joshua~

To me this is a very emulated question.
What types of emulators are you interested in? Game emulators or ?
I think if you explain yourself a little more you may get a better answer instead of a bunch of general statements.