I think you are talking about 35mm if you want 20 rolls, for me, the best color negative i've used so far is Reala 100 on 120 only and then followed by Ektar 100, also new Kodak Portra films [160/400/800] are decent too, so i can confirm that Ektar 100 is a nice color neg to use, doesn't matter what you want to use it for, just know how to meter the exposure and use good lab to process it if you will not do it yourself and you are good to go.