Most others are cheaper. Tell us what you want to do with it, in what order of priority, how you estimate your computer literacy and inclination to learn. Sibelius was meant to be optimised for ease of learning, but often the effect proved the opposite.

If you want to take no financial risk, try MuseScore, which is free. Mudcatters tend to use free ABC software such as EasyABC or ABCexplorer for obvious reasons - quite a different "philosophy" from Sibelius.