"butt plug" or "plug": which is better?

I’m planning to use a butt-plug for my self-bondage games and I would like to ask something:

I have once tried to insert a carrot, just to know how it was to have something inserted…and it was pretty hard to put in. It was only 2cm wide so it wasn’t really special.

I have seen several buttplug for sale, vibrating one and “regular”. Which one should I use as I have never tried anal play? I know it’s weird to putt something there…but having read about orgasm possibility by using a butt plug, I would like to give it a try. To reach orgasm with a plug, do you need a vibrating model? thanks!