LLC vs. Corporation start-up fees?

So I was looking into registering an LLC rather than going the route of sole proprietorship, but in my state the initial and annual update fees are big. At this point, the business income would barely be enough for the registration fee, let alone the annual update filing fees! So, would it make more sense to begin operation as a sole proprietorship and then transfer it to LLC after it has been established...?

Also, thought it was a bit odd that corporate startup and annual fees are more than half as less as LLC fees.