gd levels bc there are more types of uniqe gd objects (with scaling and recoloring and stuff) that there are mc blocks

but the x and z values go as far as 31,999,872 in minecraft and the y value goes up to 320
that's a lot of room to place blocks

gd levels can be infinite

so can minecraft worlds

the integer limit:

you can place more than one object in a grid space

you can customize triggers infinately

i’d definitely have to say minecraft since the world is infinite in bedrock edition and geometry dash is limited to what a single side scrolling screen

but the different ways you can use the blocks and the gd editor isn't limited to the grid like in minecraft, also there are an infinite amount of objects you can use in a level (if your pc can handle it)

I’d say Minecraft just because they can utilize the third dimension.