Talking about competitors only makes sense in narrow circumstances. The fact is, a lot of people who find you don't know who your competitors are, and it's better to keep things that way! Let them Google for alternatives -- half they time they won't find any, and if they do, when they see that other page, they don't know how legitimate that other company is -- yours is already the "standard" in their mind. The others are implicitly on the defensive and it's better not to legitimize them on your own page.