I agree with most of what MrShorty says above. It's hard to ascertain which method is faster without knowing a lot more.
However, if I were to hazard a guess, the 2nd option (For Loop) would almost produce a faster solution as you may be able to utilise more of your processor as you are solving for 63 solutions at 1 go, rather than solving for each 1 at a time.
Having said that, I would propose the following solution. Rather than use a For Loop where the number of iterations is fixed, I would propose using a Do Loop instead. That way, you only run enough iterations to achieve your objective, rather than running it 100 times when you only need 20 to solve.
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