Aspects that I presently see are:
1. The higher the liquidity, the better.
2. A contract with the smaller currency equivalent is better, if everything
else is the same - this makes a finer position sizing possible (relevant
for not so big portfolios). So prefer mini instruments over normal
3. Taking an instrument in the own ('home') ...
People on the buy and sell side who do not sit in Japan usually use SGX Nikkei 225 Futures as
it is denominated in JPY (sorry, initially said it was USD which was wrong)
it also trades when JP Market is closed.