Newer research actually says that it mostly doesn’t matter. Use a readable sans or serif, there’s no measurable difference.[1][2][3]
[1] Wery, J.J., Diliberto, J.A. The effect of a specialized dyslexia font, OpenDyslexic, on reading rate and accuracy. Ann. of Dyslexia 67, 114–127 (2017). https://doi.org/10.1007/s11881-016-0127-1
[2] Kuster, S.M., van Weerdenburg, M., Gompel, M. et al. Dyslexie font does not benefit reading in children with or without dyslexia. Ann. of Dyslexia 68, 25–42 (2018). https://doi.org/10.1007/s11881-017-0154-6
[3] Rello, L., Baeza-Yates, R. How to present more readable text for people with dyslexia. Univ Access Inf Soc 16, 29–49 (2017). https://doi.org/10.1007/s10209-015-0438-8
I really like me a good serif. Computer (Latin) Modern is very satisfying. Also, according to some research, it’s up there with the Helveticas and the Arials for readability. Note that 12-point is where serifs flourish (figuratively).