Are you coming from the airport?
If so, then SR 417 is your best bet, it will take you right to 192.
If you are coming down I4 then you can stay on I4 to 192 or get onto SR417 to 192. From I4, SR 417 is longer but is almost always less crowded and may be faster depending on the time of day.
I don't normally take 417 from the beginning in Sanford to the parks as I'm cheap (from my house in Deltona), but I always take it to and from the airport (MCO) or to Sanford (SFD)
It's around $6.00 from SFD to 192.