With my daughter I used a bunch of different brands. She was using Nuby bottles at the time and loved their soft spot ones because they were similar to her bottle nipples. Getting her to switch was tricky but they were very easy to open and she spilled her formula on the kitchen floor a couple of times. Since she liked soft ones I got her an Avent cup. I don't think she ever used hard spout cups. I can't remember the other brands of cups that she used, but basically all I did was try to press on the spout through the packaging. If it was totally hard I didn't buy it, if it seemed a little soft I did.I got Tommee Tippee cups for my son from Toys R Us. I really like that brand. The spouts are hard on the inside so kids can't chew through them but they're softer on the outside so it doesn't feel as strange. He liked them at first but he ended up just stealing his sister's straw cups so we got those for him instead of making him transition through the different stages of cups.While my kids were still on formula I made it directly in the cups. I measured out the water using a bottle and then learned how to eyeball the right amount of water. Now they're both older so they just get milk, juice and water in their cups.