I am 40 yr old man.I want to cut my hair very short. Should I leave some length on top or go short?

I am wondering if it should be an all over buzz cut with clippers to have same short length everywhere or a scissors cut with some length left on top

I am wondering if it should be an all over buzz cut with clippers to have same short length everywhere or a scissors cut with some length left on top to comb. what should look better when it is growing back ?Also I am wondering if I get a clipper cut will it be difficult to grow it back ?

or:I am wondering if it should be an all over buzz cut with clippers to have same short length everywhere or a scissors cut with some length left on top to comb. what should look better when it is growing back ?Also I am wondering if I get a clipper cut will it be difficult to grow it back ?

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