Hydraulic options

I'm nearly done with my gravel build, and am down to brakes as the only unsettled item on the build sheet.  For a variety of reasons, including ego, I'm going with hydraulic brakes.  That said, SRAM's system, and the Shimano Di based levers are off the table.  From what I know, that leaves the TRP Hy/Rd, Parabox and Hope V-Twin options left.  

So... Does anyone have experience with these? I'm leaning toward the Parabox system, but I'm still open to convincing.  Reasons? Anyone have a full system they'd like to give me (and I'll write up a review)? Any empirically derived negatives?

MJ