A stair installation win has me torn between glue and tack strips.

There's always been a split among us on how to best secure carpet on stairs. One side says adhesive gives a cleaner hold and looks better. The other side insists tack strips are safer and make future repairs easier. I just finished a job with some tricky winder stairs, and I used adhesive for the first time in a while. It went down perfectly with no wrinkles, and the customer was thrilled. This small success has me second-guessing my usual choice. What do you all think is the better method for stairs?