Finasteride, oral vs topical

In regards of sides, long time safety, price, practical usage what are the arguments for each method. Also is it possible to make the topical version at home. I’d highly appreciate objective arguments at with some literature for evidence, but of course own experience with trying out these methods.

Oral is better if you don’t get side effects because it addresses the miniaturization that you can’t see in parts of your scalp where you may have already started balding. The topical only works where you put it and spreading it all over your scalp, doesn’t make sense if the pill can do it a a fraction of the cost without the nuisance of daily applications which are time consuming