Best potty seat
I think potty seats are a personal choice. Our first potty came a part to be a stand alone little potty or the top could be placed on top of the toilet, plus it was a stool.
The potty we have now for our youngest is an Elmo one that makes the flushing sound and says something that I have learned to tune out. It is a a stand alone but can be placed on the potty as well. Jr. likes it as a stand alone and so do we as it leaves our toilet free for other people!
We used the little ring seat that went on top of the regular toilet.