your first reaction to a good direct drive is that it will sound somewhat digital, in that it won’t have any character of it’s own. of course, it can sound perfectly natural yet the lack of coloration will require an adjustment. it will have more slam, but not quite the drive, of your idlers. lower noise, blacker backgrounds, wider stage, a bigger, spacious type sound, not quite as focused. it might be more speed steady than your belt drive.
Rock music will soar with direct drive. large scale will hold together. maybe slightly less sexy than the belt drives, maybe a touch less liquid. the contrast will depend on the quality of your three choices for drive types and their level of condition and set-up and ancillary gear.
as you go up the food chain for each of these drive types they all get very quiet and there are fewer downsides of their drive types, just attributes to enjoy. better bearings, heavier platters, higher mass plinths, better motors....matter in each drive type. no replacement for displacement. music loves to be grounded solidly.