What's the recommended resolution size to train your models/loras? SD 1.5 is 512x512 SDXL 1.0 is 7

What's the recommended resolution size to train your models/loras?
SD 1.5 is 512x512
SDXL 1.0 is 768x768 and 1024x24 optimal right?

But what happens if you train 2k resolutions? Would it matter or help at all?
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