Quote from kiwi_trader:
SGXNK does 5pt ticks rather than the tokyo 10pt. Its free for data and has reasonable fees. Very good liquidity and nice trender.
HSI is more volatile but 1tick only = 6.40 per contract. Lower liquidity but you can get filled at your price if you use limit orders and your intelligence. Definitely trickier but rather fun with it.
If I hadnt started on HSI before SGXNK was available I suspect I would be trading SGX but HSI is an intense experience with very reasonable exchange opening hours.