I took several quilting classes with Donelle McAdams and she swears by 60wt
Quilters Select cotton/poly thread.
Apparently she tested sewing 50 patchwork squares with this thread and 50 using 50wt thread.
She says when she stacked them up and compared the stacks the 60 wt stack was 2/3rd the height of the 50 wt.
She says if you do your patchwork with the thinner 60 wt thread your HSTs come out sharper, your seams are flatter and your points crisper.
And she says you'll hear top designers recommending the color "Nimbus" as the best for blending in with any color patchwork and also for quilting and topstitching.