There is also the core Shares CSP500 .. the SYG is slightly different in that it tracks MSCI USA 600, so some extra in the tail .. not sure performance will be much different so issue is costs, divs and type.
STX is total return, no divs paid out and is feeder fund, so they just putting in a US SP500 ETF .. should make it cheap but adds small extra layer of risk, but iShares is the feeder.
CS is cheap - but that TER goes up in next few months
So really it depends do you want divs and what are the TERs ans STX500 likely cheapest
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