If you can find all 3, why not treat yourself and drive them all! 😆 I wanted an ISF, by the time I was in the market to purchase, the GSF was reasonable stretch and personally I preferred the looks and the more modern interior. I get golf clubs, golf trolley, shopping, dog food run, luggage bags etc all in boot no probs, only down side being rear sets don't fold but cant have everything!
Whatever your decision, as all the comments have hinted at above, you really won't go wrong and it will come down to preference, if I didn't have the GSF, it would be an RCF or ISF for sure. Happy hunting and look forward to hearing your thoughts if you get out for a drive and of course if you cancel your order 😛