you can choose either GRS or BTC payout
for GRS payout, the payout scheme is different, srcxxx calls it pay per speed (PPS)
he posts the price for each 1Mh speed on twitter
currently it is 750 PPS
so if your miner hashes at 1 Mhs and you mine for a day you would get 750 GRS
last price of GRS in mintpal as of writing is 0.00000346
750 GRS * 0.00000346 BTC = 0.002595 BTC for 1Mhs
That is weird, do I get more if I change my payout from BTC to GRS?
it depends, crypto price is very volatile
GRS price is now down to .00000222 BTC
but if you are willing to hold GRS and wait for better prices then it may be better to have GRS payout