Not sure what buttons you are seeing, it may depend on your choice of skins. I
do have two "Reply" buttons, but the one on the actual post, will add the entire post as a 'quote' in the 'reply window text box. Have never used that, that I can remember. The other "Reply" button simply opens the 'reply' screen with a completely blank text box. Haven't use that much since we got the "Fastreply" option.
Thus, the "Reply" button on each post is for replying to that one post, so it quotes that one post for you. The 'generic' "Reply" button is for replying to the
thread in general, rather than any one post, so you get a blank 'reply' window.
Finally, the "Quote" button on each post allows you to select
more than one post to add into a reply.
All this just confuses me, so I just use the neat, compact "Fastreply" window where I can also easily read the post I'm probably replying to.
Smileis are still available, if you need them, but not in your way otherwise. The formatting tags are so simple, even I can remember them!
HTH's