Yes Azazel is right it is a big thing to commit too.
It would also really depend. If your looking at the D/s part of bdsm then yes Master/sub or slave.
But BDSM has so many dynamics and types of relationships. There are Daddy Doms and baby girl relationships. And you can also dive into the whole sadist machoist parts of bdsm and some just enjoy the bondage.
Personally, I lean to the Master/slave dynamic. Theyes nothing like hitting subspace when your Master has just pushed you over a limit. 
You also have one who enjoy the scene of BDSM but for whatever reason don’t want/need a relationship so in that case they generally meet up and are more of a Top/bottom senario.
one is the Top acting much like a dom and the other bottom who acts as the submissive.
There are also Switches. Which is someone who can go from being Dom to sub and vice vera.
So it’s really hard to put things ato one end or the other because there are so many aspects.
I once new a Mistress who hado a sub but she also had a Master.
And some dogs are poly. And more than one sub.
So it’s really more about you and your partnEricsson and what works best for you. Some times that means experiment until you find the right fit for you.
I hope this helps. If you have anymore questions feel free to ask 
