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For the sake of around $40, I’d do both axes at once.
Having had to take my X-Carve apart a couple of times, the less often you have to do it the better.
Expanding the Y axis would be more useful plus it’s easier to brace the extra length with brackets to the spoil board/extrusion which toy couldn’t do for the X axis.
Apart from the difficulty/expense of getting 1800mm Makerslide here in Oz, a bigger machine wouldn’t fit in my CNC shed!