Ladies I need your advice....

What kind of seat do you have that your toddler TTed with? Do you have any recommendations for me?

DH bought one of those ladder ones with the seat that sits over the usual toilet seat. For the first time I put DD on it and I think the height thing, plus the fact it doesn't feel very stable may have worried her - hence it was an unsuccessful attempt. For your info DD hasn't showed any interest in TT yet, but I'm trying to get her used to it.
Is a potty a better option? Or is there an Apple iPhone application I can download (iPood ) that I could download to train DD instead...(ok ok, last one was my mere attempt at humour!).

TIA!