Pyramiding and trade management

[rookie]

wanted to hear your thoughts on the several ways a trader can add to a position, among which is pyramiding.

I understand pyramiding involves adding to a position from the base up. that is, you first buy 10 lots. Then, if the trade goes positive you add 7, 4, etc

On the other hand, a fixed approach involves adding a fixed number of units. i.e. 5, then 5 and so on.

which one would you recommend? it is apparent that you end up with smaller losers and winners when using a fixed approach.......

any thoughts on this?