If it works for you then it is not like the consoles it is aimed at will suddenly develop new graphical formats, and again while clunky most newer tile editors are not going to magically become editing suites owing to the limitations of the consoles they are editing (I am never going to get a gimp style gradient function in a tile editor, though I might be able to export to gimp and use indexed mode.
Anyway my usual choices of editor are
A bit clunky, especially on the custom tile size front, but I keep it handy anyway, especially if I am doing GBA games and just want to have a palette ripped from a savestatehttps://www.romhacking.net/utilities/112/
A general purpose editing tool, mainly aimed at the GBA and DS, but its tile editor is for me the best one going (custom sizes, most formats out there, all sorts of nice options for font bothering as in you can type or convert windows formats, rotation, scaling, arrangements, byte skipping, import and export to common formats and much more besides).https://www.romhacking.net/utilities/818/
Not technically an editor but a hell of a viewer, and uses a more abstract way of decoding tiles than the more conventional 1bpp, NES, SNES, GBA 4bpp, GBA 8bpp...http://www.romhacking.net/utilities/646/
I have some others for more specific purposes like DS 3d textures (not all fit the conventional tile format) but if I am rolling up to some random ROM then the above three usually do right by me.