Any of the Dot4 fluids are excellent.
Its a coin toss since clean brake fluid is more important than brand. Bleed yearly, topoff as needed, and siphon/refill regularly.
Castrol and Valvoline seems to have the most shelf space. But, now other brands of Dot4 have popped up, like Prestone, Pyroil, QuakerState, Gunk, and the store brands.