From either park I would go up to I-20, east on I-20 to I-45, north on I-45 to I-30, east on I-30 to 2nd Avenue. I-45 typically has less traffic than I-35E. And also skirts around the I-30 downtown corridor that can often be very slow.
Lots of parking on fair grounds. Been a few years but last time we parked in lot 5B. Very convenient but may be full if you arrive late. Don’t park in the off site places where there are people trying to wave you into their yards.