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Either way will work. It is often a matter of economics and the required equipment loads and wind loads on the structure. A large self supporting A shaped tower would be an example of support by "stiff steel rods" with a wide base reaching up to support a narrow top. It has forces acting in two major directions. A slim antenna tower supported by guy cables also has a wide base (the guy anchor bolts) and forces acting in two major directions (the tower itself is one and the guys are the other). Personally I have always found it very easy and inexpensive to just add three guys to a mast such as described. I use black dacron UV resistant rope as the guy material in many cases.
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