[mr_dove]

I'm currently on a titec 105mm, 10 degree rise stem. I'm swapping this stem to MrsDove's superlight and replacing mine with a new stem (different color).

what's gonna be most comfortable (closest to the same) as the current stem. 105mm, 0 degree or 90mm, 10 degree?

 

[oldfart]

Realistically. No one on a web site can tell you. We don't know how well the old one fits you or how badly. Even then, some person could "fit" you up on your bike, but you might not feel comfortable. You are the best judge.