ZYXI vs UNH vs MCK vs INVA

For growth investors, Innoviva, Inc.

(INVA) is the stronger pick with 18. 5% revenue growth year-over-year, versus 4. 4% for Zynex, Inc. (ZYXI). Zynex, Inc. (ZYXI) offers the better valuation at 0. 6x trailing P/E, making it the more compelling value choice. Analysts rate UnitedHealth Group Incorporated (UNH) a "Buy" — based on 52 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, Zynex, Inc.

(ZYXI) is the cheapest at 0. 6x versus McKesson Corporation at 29. 2x. On forward P/E, Innoviva, Inc. is actually cheaper at 11. 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: McKesson Corporation wins at 0. 49x versus Innoviva, Inc. 's 1. 15x — a PEG below 1. 0 traditionally signals the market is underpricing earnings growth.

Over the past 5 years, McKesson Corporation (MCK) delivered a total return of +286.

9%, compared to -98. 9% for Zynex, Inc. (ZYXI). Over 10 years, the gap is even starker: MCK returned +348. 1% versus ZYXI's -29. 4%. 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), McKesson Corporation (MCK) is the lower-risk stock at 0.

04β versus Zynex, Inc. 's 4. 55β — meaning ZYXI is approximately 10453% more volatile than MCK relative to the S&P 500. On balance sheet safety, Innoviva, Inc. (INVA) carries a lower debt/equity ratio of 23% versus 2% for Zynex, Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Innoviva, Inc.

(INVA) is pulling ahead at 18. 5% versus 4. 4% for Zynex, Inc. (ZYXI). On earnings-per-share growth, the picture is similar: Innoviva, Inc. grew EPS 816. 7% year-over-year, compared to -66. 7% for Zynex, Inc.. Over a 3-year CAGR, ZYXI leads at 13. 9% 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.

Innoviva, Inc.

(INVA) is the more profitable company, earning 63. 8% net margin versus 0. 9% for McKesson Corporation — meaning it keeps 63. 8% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: INVA leads at 38. 5% versus 1. 2% for MCK. At the gross margin level — before operating expenses — ZYXI leads at 79. 5%, 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, McKesson Corporation (MCK) is the more undervalued stock at a PEG of 0. 49x versus Innoviva, Inc. 's 1. 15x. A PEG below 1. 0 is traditionally considered the threshold for growth-adjusted undervaluation. On forward earnings alone, Innoviva, Inc. (INVA) trades at 11. 9x forward P/E versus 20. 2x for UnitedHealth Group Incorporated — 8. 3x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for INVA: 65. 2% to $37. 67.

In this comparison, UNH (2.

4% yield), ZYXI (0. 5% yield), MCK (0. 4% yield) pay a dividend. INVA does not pay a meaningful dividend and should not be held primarily for income.

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

04), +348. 1% 10Y return). Zynex, Inc. (ZYXI) carries a higher beta of 4. 55 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (MCK: +348. 1%, ZYXI: -29. 4%), 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: ZYXI is a small-cap deep-value stock; UNH is a large-cap quality compounder stock; MCK is a mid-cap high-growth stock; INVA is a small-cap high-growth stock. ZYXI, UNH pay a dividend while MCK, INVA do not, making them suitable for different income and tax situations. 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.