Welcome to the site.
Age, height, leg & arm length, desired seating posture matter. Intended terrain & speed matter. Grade & length of hills you would encounter matter. Weight & load carried matter. Post under help selecting an ebike and please provide link to the models.
My only advice is that at age 58 I started having trouble getting the leg over the seat of a high bar bike. Now age 71 I have trouble getting the foot over the drop frame left. You can manage strength & heart health as you age through exercise, but stiffness of muscles is inexorable.