I use Cubase and Fruity, simply because they're the first two programs I happened to use in the beginning (well, not cubase, that came a bit after, but you get my drift). If I'd used Logic first, I'd probably be using that :lol: They say try demos of different sequencers to see which one u prefer but to be honest I don't think it matters a great deal, whichever one u learn to use will be a little bit difficult at first but will pretty much do everything u want it to do.
It may be worth learning the sequencer that other people u know use. That way, if u get stuck u can ask them, rather than them saying "dunno mate, I use Logic" or something. If u ask people whats the best sequencer to use, most the time they'll reccomend the one they're using :lol: