ISE vs Regents.

Five questions.
Five answers.

1. Do you want IB Diploma on American AERO/NGSS — or British IGCSE with A-Level fallback?

Both schools deliver IB Diploma at Sixth Form — this pairing is rare in that respect. The fork is foundation and optionality. ISE runs American AERO + NGSS from primary through IB Diploma — MAP, PSAT, and SAT integration built in, with an American high-school diploma available at G11–12 alongside IBDP. No British IGCSE, no A-Level alternative. Regents runs British EYFS through IGCSE, then offers a real IB Diploma or A-Level choice at age 16 on the same campus — the only Eastern Seaboard school in the directory with both pathways. If you are committed to American credentials and US-university planning from early years, ISE. If you want British primary with insurance against IBDP at G11, Regents.

2. Do you need boarding on the Pattaya side of Chonburi?

If yes — Regents, full stop. Boarding from Year 3 at ฿434,000/yr plus ฿30,000 refundable retainer. Y13 full boarder all-in ≈ ฿1,263,350/yr before extras. ISE is day-school only — no boarding option. For families relocating without a settled address, or parents who travel, Regents is structurally the only option in this comparison. If boarding is non-negotiable and you want pure British A-Level boarding culture, also run Rugby vs Regents — Rugby boards from age 10 on an 80-acre campus.

3. Sriracha commute or Pattaya-side Pong — where does your family live?

ISE at Bowin, Sriracha sits ~35 minutes east of central Pattaya — structurally closer for families in Sriracha, Laem Chabang, or the Bowin industrial corridor. Regents at Pong, Banglamung sits on the Pattaya side — typically 15–25 minutes from central Pattaya depending on traffic. Neither is walkable from Jomtien or Naklua without a bus. If you anchor east of Pattaya, ISE wins logistics; if you live in Pattaya City, Pratumnak, or need Pattaya-side community, Regents wins. Test both school-run commutes before enrolling.

4. Can you budget ISE tuition-only vs Regents premium band?

Both schools publish verifiable year-by-year numbers — ISE is lower at every overlapping peer stage on tuition alone. ISE: ฿358K (Pre-K) → ฿514K (K–G5) → ฿601K (G6–8) → ฿617K (G9–10) → ฿646K (G11–12 IBDP tuition only). Regents: ฿436K (Pre-N) → ฿604K (Y1–2) → ฿636K (Y3–6) → ฿706K (Y7–8) → ฿829K (Y10–13 flat). The gap widens at secondary — ~฿212K/yr at Year 10 peer. Whether Nord Anglia premium, boarding, CIS credentials, and A-Level optionality justify ~฿183K–212K/yr more at Sixth Form depends on your family's priorities. Add ISE lunch, bus, and exam fees; add Regents bus (฿18K–32K/term) and boarding if applicable.

5. WASC small-school US track — or Nord Anglia CIS network at scale?

ISE holds WASC accreditation since 2000 and runs a deliberately small campus (~150 students, 8:1 ratio, 50+ nationalities) inside Burapha Golf Club — intimacy, American transcript portability, and TOEFL/SAT integration over Nord Anglia scale. Regents sits inside Nord Anglia Education — 80+ schools across 30+ countries, MIT for STEM and Juilliard for performing arts partnerships, CIS and IBO credentials, cross-network teacher exchanges and relocation portability. If your family relocates globally and wants seamless Nord Anglia transfers, Regents. If you want the only American-through-IB pathway in the directory at lower published tuition with WASC audit rigour, ISE.

Summary verdict

• Choose ISE if: American AERO/NGSS through IB Diploma fits your plan; WASC accreditation and a deliberately small cohort (~150 students) matter; you live east of Pattaya (Sriracha, Bowin); MAP, PSAT, SAT integration fits US-university planning; lower published tuition at every peer band matters; and you accept day-school-only with no A-Level fallback at 16.
• Choose Regents if: you need boarding from Year 3 on the Pattaya side; you want IB Diploma or A-Level as a real choice at 16; British IGCSE foundation through Sixth Form fits your credentials plan; Nord Anglia global platform and CIS/IBO credentials matter; premium campus scale justifies ฿829K at Sixth Form; and the Pong commute works for your family.

Neither fits — if…

You want American + IB at lower fees in Nongprue — see ISE vs MIS. You want IB Diploma without Nord Anglia pricing — see Garden vs Regents or St Andrew's vs Regents. You want pure British A-Level without IB — see Rugby vs Regents. You want Rayong British+IB vs American+IB — see Garden vs ISE.