A Vaccine is better for chickenpox because it can come back later as shingles but it is not chickenpox. Children should probably have gotten this disease, had almost no problem with it, gained immunity and contributed to hurd immunity.
I made sure my children were all exposed. to there “childhood” diseases when. they were young ....These vaccines do not give life long immunity, and need boosters as they age... Measles a relativity benign disease in childern become a serious one as you age..
My Daughter in law caught chickenpox as an adult and was very sick