In my time here, both topical dutasteride and topical finasteride have cycled in and out of fashion.
It has been like this with everything it seems: first folligen was better than tricomin, then it was the other way round; for a while topical finasteride was hot, then it was worthless. Dr. P's products, spironolactone, revivogen, crinagen all have their respective moments in the sun before being vilified by subsequent rounds of posters.
Anyhow, unless things have changed, there was quite a bit of debate whether topical finasteride/dutasteride worked, if at all, through systematic absorption. Some users reported erectile problems, loss of libido, brain fog etc. when using the topical versions - certainly not an improvement when trying to avoid side effects.