Depends entirely on your needs.
Most people view rimfires as "trainers" for their bigger guns, myself included. If "bigger guns" includes iron-sighted defensive handguns, your quality of cross-training with a glass-sight rimfire goes down. If, for reasons of cost, the majority of your handgunning is in .22, I'd call that a good argument to stick with iron sights.
But, you may have eye issues that are helped by glass (in which you might consider glass on defensive pieces), or you're "seriously using" your rimfire for pest control, small game, woods survival, etc, maybe glass helps.
There's no one right answer, and none of us should second-guess your call.
My personal opinion is that "to be traditional" isn't a good reason in and of itself to stick with iron. Functionality for your needs should be top priority, "authenticity" way down on the list unless this is for "cowboy sports" use (there are some rimfire side matches in CAS/SASS).