Stacks of $100 bills.

Image source: Getty Images.

This article was updated on Nov. 11, 2016, and originally published on April 20, 2016.

On its own merits, AT&T (NYSE:T) sure looks like a mighty fine dividend stock. The current dividend yield stands at a generous 5%, at the tail end of 31 consecutive years of annual payout boosts. It's a bona fide Dividend Aristocrat, backed by a well-known brand and a $230 billion market cap.

What's not to love?

As it turns out, there are many ways to improve on AT&T as a dividend play. Let me show you why I would rather own 3M (NYSE:MMM), American Tower (NYSE:AMT), or Seagate Technology (NASDAQ:STX) in a dividend-focused portfolio today -- all for very different reasons.

Bigger isn't always better

Let's start with industrial innovator 3M. Like AT&T, this is another giant of American industry -- a familiar name in any household. But their long-term dividend strategies are extremely different.

At first glance, it's easy to get stuck on the current dividend yields. There, Ma Bell easily takes the crown with a solid 5.4% yield versus 3M's less exceptional 2.6%. No need to dig any deeper, because this fight is already over. Right?

Not so fast. Have you seen this chart?

T Dividend Chart

T Dividend data by YCharts

In plain English, this is 3M putting a lead foot on its dividend accelerator in recent years. Since 2013, management has committed to returning a lot of cash to shareholders -- mostly via generous dividend increases and share buyback programs.

If you thought that AT&T's 31-year history of modest dividend increases was impressive, 3M's streak is nearly twice as long, And at least in recent years, 3M's payout boosts have been far more generous.

Moreover, AT&T's management is currently focused on using spare cash to pay down debt rather than raise dividends. In contrast, 3M is using its superior credit rating to add more debt to bolster its balance sheet -- leaving lots of room for large dividend increases.

In the eyes of many income investors, consistent and lavish dividend growth trumps rich yields paired with stagnant growth. That's how the comparison between 3M and AT&T works out, and it's in 3M's favor.

Short but sweet

Moving on to wireless tower operator American Tower, that company does not come with decades of dividend history. This dividend policy is only 4 years old, but investors have enjoyed some massive increases over that short span:

T Dividend Chart

T Dividend data by YCharts

Granted, American Tower's yield stops far below AT&T's huge payout. Today, the ratio stands at just 2.1%.

However, as a real estate investment trust, generous dividends are absolutely required. REITs must funnel at least 90% of their pre-tax profits into dividend payments, or else lose the tax benefits of being a REIT.

In other words, these payouts will continue to rise at least as quickly as American Tower's bottom-line profits. The company is even going beyond the call of duty, as dividend payouts are soaring much faster than either EBIT profits or free cash flows.

American Tower may not be a household name of the same caliber as AT&T or 3M, but its services are nonetheless vital to running a functional wireless network in North America and beyond. The company is likely to stay relevant and healthy at least as long as smartphones need a tower-based data network. In the long run, American Tower stands a good chance of joining the Dividend Aristocrats list. Just keep in mind that I'm building that conclusion on a fairly short dividend history, augmented by what we know about REIT stocks in general.

The best of both worlds?

And that brings us to our last stop today, hard-drive builder Seagate Technology.

Here's a dominant force in the hard-drive business, with only one serious rival to speak of. Seagate's dividends per share have more than tripled over the last five years while AT&T's only increased by 11.6%. And unlike American Tower and 3M, whose stock charts have been robust, Seagate is going through a trough in a very cyclical market, driving dividend yields higher as share prices fall. Today, Seagate's 7% yield is far richer than AT&T's:

T Dividend Yield (TTM) Chart

T Dividend Yield (TTM) data by YCharts

It is understood that this stock comes with a heaping dose of risk. That's already baked into the stock price, of course. Shares took another dive last week, when management lowered its revenue guidance for the current quarter.

But we're talking about a fantastic history of dividend increases, on top of the option to lock in downright drool-inducing dividend yields at today's low share prices. Unless you think that hard drives and bulk data storage are going the way of the dodo, it's hard not to get enthusiastic about Seagate as a dividend stock.

There you have it. 3M beats AT&T in terms of dividend history and commitment to raising its payouts. American Tower is a hot newcomer to the dividend game, but what a start! And Seagate combines massive dividend growth with a nearly double-digit starting yield.

In short, it's not hard at all to find better dividend stocks than AT&T.