I have tried Zoo Med and Mazuri. My iguanas prefer Mazuri. I still offer some greens, flowers, palm dates, fruits, insects, and animal base protein from time to time. I have a lot of animals, so my food bill can be high at times. This is where I prefer Mazuri. I can get a huge 25lb bag of Mazuri here at my loal feed store for around $28.
I bucket of Zoo Med is somewhere around $65 to $70.

For Those of you having problems switching your iguanas to pellets:
1. Don't feed your iguana for a couple of days.
2. soak the pellets in water until it gets soft enough for your iguana to eat it.
3. mash some fruit(whichever is your iguana's favorite)Papaya, banana, together with the pre-soaked pellets.

Hope this helps.

Manny