Short and to the point, steer clear of dutasteride. True, it is more potent than finasteride and may result in less hair loss and/or more hair growth, but it can have neurological implications.
Research in mice raises questions about its safety when it comes to managing long-term risk for neurodegenerative diseases such as Alzheimer, since this drug through it affect on the AR1 enzyme wounds the production of allopregnanolone, a neuroprotector. Long term human trials, up to 20 years are needed to determine its safety in this respect.
Stick with finasteride, it has a long term biological model.