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I quite like doubletap but will go grx when I can afford it for better brakes and the shifter shape is nicer imo.
Better brakes due to increased pivot point is only on GRX Di2 levers (ST-RX815) the lower-tier levers don't get the same goodness unfortunately. Recently switched a road bike to 1x (GRX600 40T / SLX 11-40T) and keeping the ST-R8020 (ultegra hydro) levers for now, waiting for the goodness to trickle down in a year or so.
I quite like doubletap but will go grx when I can afford it for better brakes and the shifter shape is nicer imo.