My TronXY X1 runs on Repetier firmware. My Ender 3 runs on Marlin firmware.
I found that apparently code in Marlin style does not always create good prints on a Repetier machine, under extruding in some key areas - but that might also be setting dependant.
Of course, simple fix in the slicer by setting it to the correct style, but:
What differences are in the style of the basic commands between Marlin and Repetier?