In truth, these are from different editions of D&D. Backstab is +4 to hit and double damage in BECMI D&D, while sneak attack +1d6 is a feat for D&D 3ed. I would advise to keep them both and treat them as combat maneuvers because they can be used differently:
- To be able to backstab someone you must surprise him, id est he must be completely unaware of your presence. You can do so only if you manage to approach unseen using Hide in shadows or Move silently or both, depending on the situation.
- Sneak attack instead can be used also on a target who is generally aware of your existence, but distracted by something else or flanked. Typically, you can use this one on a target who is fighting against someone else.
If you try to backstab but fail, you can still be able to sneak attack if the target see you at the last moment.
Both are not very honorable ways of fighting but well, it's the rogue's way. And as Mino said to you "He would do worse to you, if you give him the chance. So strike first and try to strike true!"
Last edited by Sturm
on Tue May 31, 2016 11:33 am, edited 1 time in total.