Finale Vs. Allegro?

Is Finale worth all of that extra money (It depends, of course, but why)? What are the differences?

EDIT: What about Sibelius?

How do I know which one to buy?

Please respond, need to know soon--your thoughts.

Prehaps try out both demo versions. I know Sibelius costs more, but the instrumentations on Kontakt are better quality, I usually get better results than my classmates who are on Finale.

I havn't tried Allegro but they have demo versions, not sure about finale, maybe you only get note-pad.

I find that inputing notes on Finale is easier, Sibelius gets so annoying sometimes.
Hope it helps...