When I started looking for wardrobes, there are many different views that I got from my friends on which wardrobe to buy. There are definitely pros and cons of buying a steel wardrobe vs a wooden wardrobe. What I realized is that the choice depends on various factors that includes location, humidity, personal choice, cost, availability of wood or steel, cost etc.
Steel wardrobes are termite free. So, if you are living in areas where there is risk of termites eating up your wardrobes obviously steel wardrobes are better
GODREJ INTERIO Slimline 2 Door Steel Almirah with Locker, Star Mirror in Russet,Glossy Finish
Steel wardrobes are more durable, environmentally friendly, lower in cost and will last longer than wooden wardrobes.
GODREJ INTERIO Slimline 2 Door M2 Steel Almirah with Locker and Drawer in Textured Sea Pine

Wooden wardrobes look more elegant due to various options for the look and feel. The finish can include laminates, acrylic, Polyurethane coated, membrane foils etc. The color options are numerous.
Amazon Brand - Solimo Alpha Engineered Wood 4-Door Wardrobe (Espresso Finish)
Wooden wardrobes can be extremely customizable. If you have beams or if the walls are not smooth, then aligning wooden wardrobes will be lot more feasible than the steel wardrobes.
Amazon Brand - Solimo Medusa Engineered Wood wardrobe walnut finish, 4 Doors