TWSFC is faster than morphgear or pocketsnes (I don't know about the most recent bleeding edge though). It's been out since 2001, so it isn't exactly new. I found the interface kinda lame, and the virtual keyboard would always crap out.
The guy who made this is named Sukon, and his site is in Taiwanese -- good luck.
Here's a review:
http://www.pocketgamer.org/reviews/emulators/twsfc/
Various builds of the emulator can be found here:
http://www.icode.com.tw/myfiles/myfiles.asp?folder=\SFC EMU