I must say, Holograph Emulator (Dissi's edit) as it became much more stable in the Holo era. I've never used or coded Uber (and NEVER will) so... Holo's been the only thing so far until I try out Snowlight and others.
Holograph was slow, buggy, full of spaghetti code and was no use to anyone. It was also not the first emulation developed for Habbo
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Suelake, was not the best emulation. There was severs years before it, with Camera working (MrGiMmEs V7) and though Nillus claims it's threaded properly, it makes poor use of thread allocation on CPUs.
Thor wasn't as good as people like to make out either, it's alot cleaner than alot of the code any of you guys have wrote, and it performs pretty fast. However, there's nothing stored in memory, and it needs to make consecutive calls to MSSQL in order to format anything. It also likes to make use of COUNT(*), which would make the DB extremely slow if the engine was InnoDB as oppose to MyISAM.