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Here is a great comparison of high bar squats and low bar squats by @isabel.lahela. Low bar squats emphasize your posterior chain slightly more than high bar squats and you can typically lift more weight with low bar squats than high bar squats. However, low bar squats require some more elbow and wrist flexibility in order to keep the bar in position lower on your back. For that reason, I personally find them difficult.
For most people, I think the difference is pretty insignificant and if you're squatting at all then you're doing much better than most people. Unless you're more advanced, I recommend just putting the bar on your back where you feel most comfortable. Don't overthink it. When you become more comfortable squatting down the road you could try doing low bar and high bar if you want but when you first begin squatting, your main priority should be safety and proper form so doing whichever one feels most comfortable should be your focus.