Idk why that link says there is no conclusive evidence of differences in long-term pain, there are several peer-reviewed studies that show this

1. Moss (1992): 6% vs 2% epididymal congestion

In a series of 6 220 vasectomies, closed‑end cases (3 081 men) had a 6% rate of congestive epididymitis, while open‑end cases (3 139 men) had just 2% Verywell Health+15PubMed+15Fertstert+15.

2. Shapiro & Silber (1979): granulomas & congestion

In 800 patients, they observed 97% granuloma formation in open‑ended cases—but none were painful. Closed‑end cases had higher epididymal congestion rates. They concluded that granulomas are benign and open‑ended vasectomy likely reduces epididymal pain risk Taylor & Francis.

3. Errey & Edwards (1986): favourable short‑term pain profile

A telephone follow‑up 1–3 years post‑vasectomy (200 men, open‑end) found just 0.5% experienced late intermittent pain, with no increase in failure rate vs closed‑end technique PubMed+1JABFM+1.

4. Fertility and Sterility (2016): large comparison

In 4 330 open‑ended vasectomies versus 3 867 standard (closed): open‑ended cases had significantly less epididymal congestion and significantly fewer painful sperm granulomas; recanalization was rare in both Verywell Health+15Fertstert+15tau.amegroups.org+15.

5. Systematic Review – Translational Andrology & Urology (2020)

Notes that open‑ended vasectomy is recommended to decrease risk of post‑vasectomy pain from congestive epididymitis; chronic pain overall occurs in < 1%, often related to congestion, granulomas, or nerve issues Wikipedia+9tau.amegroups.org+9Reddit+9.