I used an iron stand on my 29 gallon tank when I first set it up. After a year or so when I started the tank over with new substrate, decorations, etc. I went with a wood stand instead. I prefer them because I think they look better, they distribute the weight better and they hide equipment/supplies better.
Gene Heitman - 12 tanks (11 freshwater and 1 saltwater), 206 gallons, 20+ species of fish/shrimp/snails, 52+ species of plants ... 10 years ago I just wanted 1 tank with some fish