RDCM vs CIEN vs VIAV vs ADTN vs CALX

For growth investors, Calix, Inc.

(CALX) is the stronger pick with 20. 3% revenue growth year-over-year, versus 8. 4% for Viavi Solutions Inc. (VIAV). RADCOM Ltd. (RDCM) offers the better valuation at 22. 7x trailing P/E (13. 7x forward), making it the more compelling value choice. Analysts rate RADCOM Ltd. (RDCM) a "Buy" — based on 3 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, RADCOM Ltd.

(RDCM) is the cheapest at 22. 7x versus Ciena Corporation at 644. 8x. On forward P/E, RADCOM Ltd. is actually cheaper at 13. 7x.

Over the past 5 years, Ciena Corporation (CIEN) delivered a total return of +924.

1%, compared to -19. 1% for ADTRAN Holdings, Inc. (ADTN). Over 10 years, the gap is even starker: CIEN returned +32. 9% versus ADTN's -6. 3%. 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), RADCOM Ltd.

(RDCM) is the lower-risk stock at 0. 78β versus Ciena Corporation's 2. 51β — meaning CIEN is approximately 221% more volatile than RDCM relative to the S&P 500. On balance sheet safety, RADCOM Ltd. (RDCM) carries a lower debt/equity ratio of 3% versus 89% for Viavi Solutions Inc. — giving it more financial flexibility in a downturn.

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

(CALX) is pulling ahead at 20. 3% versus 8. 4% for Viavi Solutions Inc. (VIAV). On earnings-per-share growth, the picture is similar: Viavi Solutions Inc. grew EPS 225. 0% year-over-year, compared to 46. 6% for Ciena Corporation. Over a 3-year CAGR, RDCM leads at 15. 8% 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.

RADCOM Ltd.

(RDCM) is the more profitable company, earning 16. 8% net margin versus -4. 2% for ADTRAN Holdings, Inc. — meaning it keeps 16. 8% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: RDCM leads at 11. 6% versus -1. 4% for ADTN. At the gross margin level — before operating expenses — RDCM leads at 76. 0%, 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.

On forward earnings alone, RADCOM Ltd.

(RDCM) trades at 13. 7x forward P/E versus 89. 1x for Ciena Corporation — 75. 4x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for CALX: 41. 1% to $61. 00.

None of the stocks in this comparison currently pay a material dividend.

All are effectively zero-yield and should be held for capital appreciation rather than income.

For long-horizon retirement investors, Calix, Inc.

(CALX) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 0. 98), +509. 0% 10Y return). Ciena Corporation (CIEN) carries a higher beta of 2. 51 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (CALX: +509. 0%, CIEN: +32. 9%), 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.

These companies operate in different sectors (RDCM (Communication Services) and CIEN (Technology) and VIAV (Technology) and ADTN (Technology) and CALX (Technology)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

In terms of investment character: RDCM is a small-cap high-growth stock; CIEN is a mid-cap high-growth stock; VIAV is a mid-cap quality compounder stock; ADTN is a small-cap high-growth stock; CALX is a small-cap high-growth 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.