K.S.
Any potty seat works. They are all the "same" in my opinion. Its just up to you if you want one w/ "bells and whistles" to make it fun, but be careful your toddler doesnt want to always play w/ or in her potty. Or its up to you if you want one thats compact, cute, doubles as a step stool, or matches your bathroom decor somehow. Its all total personal preference. I got the one that doubles as a stool and my daughter likes to dump it herself so she can turn the base over and use it to wash her hands. And as this is all fine and dandy, I'd prefer to dump it myself to avoid any mess. So just a word of caution on that one. Also you can just get a seat that fits on your toilet. It makes the hole smaller and its cushioned. Also, if you plan on having more children you might want to get one w/ a little peepee spout guard in case you have a boy. Then you can use the same one for all your children.
Good luck potty training.