I still prefer using ballpoints with schmidt easyflow 9000 ink[1], but yeah rollerballs (gel) are a great midpoint between fountains and ballpoints. My Zebra G-750[2] is super smooth.

[1] https://www.jetpens.com/Schmidt-EasyFlow-9000-Hybrid-Ballpoi...

[2] https://www.jetpens.com/Zebra-G-750-Gel-Pen-0.7-mm-Black-Ink...