- Petaluma, CA
The only advantage to adjustable is if you are not sure about the best geometry for you. And so you want to try different configurations to see what works best. Some are better than others.I had an adjustment stem on my ebike and it started creaking, so I replaced it with riser bars and an angled stem.
If you don't need to be adjusting your angle once it is set, a stem riser is a stronger option.