I-30 to I-635 to I-20 is the safest route / most likely to avoid delays.
There is currently some construction on I-30 at the west end of downtown Dallas redoing the interchange with I-35E.
Got onto the wrong ramp/ lane in my truck a week ago, and I've driven that area for over 30 years.
I don't know how close to downtown Fort Worth the construction on north I-35W is currently. Haven't been that way in a few weeks.
US-380 from Greenville to McKinney to Denton isn't a good route now if you plan to take I-35W down to Loop 820. Heavy construction delays at I-3W and Loop 820. You could take 380 over to US-281 south of Jacksboro and that down through Mineral Wells to I-20. I'd only use that route if the radio traffic told me about major delays on I-20 south of the metroplex.