NEW YORK ( TheStreet) -- With numerous factors making it increasingly difficult to predict where bond, equity, and commodities markets will head next, those seeking stability of any sort have turned to financial products which provide a consistent and comfortable pay-out in the form of dividend yields.A number of major sponsors boast products designed to track indices comprised of a collection of high-dividend paying companies, making the ETF industry particularly well suited to meet the needs of yield- seeking investors. However, although the options are plentiful, it is important to note that not all of these products are identical. For instance, while two of the most popular dividend-paying exchange traded funds: the iShares Dow Jones Select Dividend Index Fund ( DVY) and SPDR S&P Dividend ETF ( SDY), are similar in that they provide investors with exposure to companies that offer comfortable yields. However, each employs a different strategy to achieve those yields. DVY is designed to track the performance of the Dow Jones U.S. Select Dividend Index. This basket is comprised of 100 of the highest yielding U.S. companies, excluding REITs. According to the fund's prospectus, in order to gain admission into this fund's index a company must have offered a consistently high yield over time. The fund's top positions include Lorrilard ( LO), Entergy ( ETR), CenturyLink ( CTL), Chevron ( CVX), and McDonalds ( MCD). SDY deviates from DVY in its approach to seeking dividend yield. The fund is designed to mimic the performance of the S&P High Yield Dividend Aristocrats Index. Rather than simply picking out companies that have boasted a stable yield over time like DVY, this index specifically seeks out firms that have consistently increased their dividends over the past 25 years. SDY's top positions include CenturyLink, Integrys ( TEG), Vectren ( VVC), Eli Lilly ( LLY), and Consolidated Edison ( ED). With slightly over 50 holdings making up its underlying index, SDY takes a considerably more concentrated approach to tracking top dividend payers. In total, the fund's top 10 positions account for 32% of the fund's total portfolio. DVY's 10 largest holdings, on the other hand, represent less than 20% of its total assets. SDY is slightly cheaper than its iShares competitor, carrying a 0.35% expense ratio compared to DVY's 0.4% expense ratio. At this time, both SDY and DVY offer nearly 4% yields. However, investors holding SDY do have the opportunity to see even higher payouts because of its unique indexing strategy. This benefit, however, does not come without some added risk.