x10 saves you time, first and foremost. Some events have discounts on multiple pulls (see current konoha tree) or guaranteed reward (see: any seal scroll treasure). If its not stated otherwise, it shouldn't make a difference. Btw we don't even have enough data to assume drop rate % chances from pulls in general, not to mention to separate that data into x1 and x10 pulls. So all personal biased experience aside, it all comes down to rng.