B.M.
I did not want to deal with the transition from little potty chair to the toilet and opted for the style that fits over the seat...it has two steps and handles (can't remember the exaxt name, One step Ahead carries them,,so do others online, there is a regular and padded seat version)...a little awkward at first for the child to get on but worked great....no cleaning little potty pots and they get to the idea of using the big potty from the start...it really is what will work for your house, child, lifestyle (some like the portable aspect of a small potty...they take it to whatever room etc...) I just found this easy and had heard many say they couldn't get their child to use the big potty once they got used to the little one.
Good luck!
We'll probably start our 2 year old son soon...he's already gone a few times on the potty seat we're just waiting for him to show real interest...I found with my DD it was easiest to go with her taking the lead.
B.