AZN vs LLY vs PFE vs MRK vs ABBV

For growth investors, Eli Lilly and Company (LLY) is the stronger pick with 44.

7% revenue growth year-over-year, versus -1. 6% for Pfizer Inc. (PFE). Merck & Co. , Inc. (MRK) offers the better valuation at 15. 4x trailing P/E (21. 9x forward), making it the more compelling value choice. Analysts rate AstraZeneca PLC (AZN) a "Buy" — based on 41 analyst ratings — the highest consensus in this comparison. The "better buy" depends entirely on your goals: growth investors should weight revenue trajectory, value investors should weight P/E and PEG, and income investors should weight dividend yield and streak.

On trailing P/E, Merck & Co.

, Inc. (MRK) is the cheapest at 15. 4x versus AbbVie Inc. at 85. 5x. On forward P/E, Pfizer Inc. is actually cheaper at 8. 9x — notably different from the trailing picture, reflecting expected earnings growth. The PEG ratio (P/E divided by earnings growth rate) is the most growth-adjusted single valuation metric: AstraZeneca PLC wins at 0. 81x versus Merck & Co. , Inc. 's 1. 03x — a PEG below 1. 0 traditionally signals the market is underpricing earnings growth.

Over the past 5 years, Eli Lilly and Company (LLY) delivered a total return of +411.

1%, compared to -13. 3% for Pfizer Inc. (PFE). Over 10 years, the gap is even starker: LLY returned +1238% versus PFE's +29. 6%. Past returns do not guarantee future results, and the stock with the higher historical return may already have its best growth priced in.

By beta (market sensitivity over 5 years), AbbVie Inc.

(ABBV) is the lower-risk stock at 0. 34β versus Eli Lilly and Company's 0. 71β — meaning LLY is approximately 110% more volatile than ABBV relative to the S&P 500. On balance sheet safety, AstraZeneca PLC (AZN) carries a lower debt/equity ratio of 61% versus 160% for Eli Lilly and Company — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Eli Lilly and Company (LLY) is pulling ahead at 44.

7% versus -1. 6% for Pfizer Inc. (PFE). On earnings-per-share growth, the picture is similar: AstraZeneca PLC grew EPS 190. 7% year-over-year, compared to -3. 5% for Pfizer Inc.. Over a 3-year CAGR, LLY leads at 31. 7% annualised revenue growth. Higher growth typically commands a higher valuation multiple — check whether the premium P/E or P/S is justified by the growth rate using the PEG ratio.

Eli Lilly and Company (LLY) is the more profitable company, earning 31.

7% net margin versus 6. 9% for AbbVie Inc. — meaning it keeps 31. 7% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: LLY leads at 45. 6% versus 23. 4% for AZN. At the gross margin level — before operating expenses — LLY leads at 83. 8%, reflecting greater pricing power or product mix advantage. Stronger margins indicate durable pricing power, lower cost of revenue, or higher mix of software/services. They are one of the clearest signs of business quality.

The PEG ratio (forward P/E divided by expected earnings growth rate) is the most precise measure of undervaluation relative to growth potential.

By this metric, AstraZeneca PLC (AZN) is the more undervalued stock at a PEG of 0. 81x versus Merck & Co. , Inc. 's 1. 03x. A PEG below 1. 0 is traditionally considered the threshold for growth-adjusted undervaluation. On forward earnings alone, Pfizer Inc. (PFE) trades at 8. 9x forward P/E versus 28. 2x for Eli Lilly and Company — 19. 3x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for LLY: 29. 1% to $1258. 47.

All stocks in this comparison pay dividends.

Pfizer Inc. (PFE) offers the highest yield at 6. 5%, versus 0. 6% for Eli Lilly and Company (LLY).

For long-horizon retirement investors, Eli Lilly and Company (LLY) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 0.

71), 0. 6% yield, +1238% 10Y return). Both have compounded well over 10 years (LLY: +1238%, PFE: +29. 6%), confirming both are viable long-term holds — but the lower-volatility option typically results in less emotional selling during corrections. Retirement portfolios generally favour predictability over maximum returns. Consult a financial advisor before making allocation decisions.

Both stocks operate in the Healthcare sector, making this a peer-level intra-sector comparison — the same macro tailwinds and headwinds will affect both.

In terms of investment character: AZN is a large-cap quality compounder stock; LLY is a large-cap high-growth stock; PFE is a mid-cap income-oriented stock; MRK is a large-cap deep-value stock; ABBV is a large-cap income-oriented stock. These fundamental differences mean investors should not choose between them on a single metric — the "better stock" depends entirely on which of these characteristics aligns with your investment strategy.