At one time, people would have laughed at the idea of paying for radio. Now millions of us are happy to fork over cash each month for the pleasure of enjoying radio without interruptions by annoying commercials. But changing satellite radio providers isn't as easy as spinning the dial. Now that you've got to pay for radio, you'll want to figure out for yourself which one offers the most enjoyment for your money. In this article, we'll compare the two most popular satellite radio companies, Sirius and XM, on several critical buying factors:

Comparing Satellite Radio Companies: Selection

With cable TV, most shows are affiliated with certain networks but are still viewable for all cable subscribers. However, with satellite radio, programs are affiliated with certain satellite providers so your programming options are dependent on the provider you choose. Both satellite radio companies offer the standard music genres; it's the specialty programming that will most likely sway your decision.

If you have an affinity for Howard Stern, Martha Stuart, or Maxim radio, you'll probably want to choose Sirius. If Ellen, Oprah, or the Playboy Channel seems more appealing to you, you might like XM radio. Before making a selection, it's wise to view each satellite radio company's channel lineup.

Comparing Satellite Radio Companies: Pricing

Both XM and Sirius satellite radio services have the exact same monthly and yearly fee up to the two year mark. If you prefer to pay for more than two years in advance, you will realize a savings with Sirius who offers a lifetime subscription for $499.99. XM offers a 3, 4, and 5 year prepaid subscription plan that costs substantially more at $359.64, $ 479.52, and $ 599.40 relatively.

Any of these plans aside from Sirius's lifetime plan don't have to be paid up front. The reduced cost is divided up over your subscription plan and made in monthly payments. However, should you choose to cancel before you fulfill your obligation, you'll be responsible for the bulk-year savings you enjoyed.

Comparing Satellite Radio Companies: Cancelling Service

While you compare satellite radio services, you probably aren't thinking about cancellation, but it's important to know the cancellation terms before you get involved. You may find that you're unhappy with the service or that a competitor has signed on a show that you just can't live without.

XM and Sirius both allow you to cancel at any time and both will refund a prorated amount for any unused days of service in the month. However XM can charge as much as a $75 cancellation fee while Sirius charges nothing.

So which is the best buy? It really depends on your favorite programs. In comparing satellite radio companies, both are very similar in price and channel volume. The one place were they truly differ is the choice of programming.