For a new shooter the longer the brace height the better as it will be more forgiving on the shot.

The brace height is measured from the throat of the grip to the string when the bow is at rest.

There are more variables than just brace height to worry about as well like the axle to axle lenght I would advise a new shooter to get a longer ATA bow say from 38" to 42" A to A over a short 29" to 35" A to A bow as the longer ones are more easy to hold straight when shooting and the shorter ones the archer tends to cant the bow either to the left or right depending on if they are left or right handed.

If you can find a longer A to A bow that has a longer than 7' brace height then you should learn a little faster and learn the correct form.