Usually, those with longer arms are actually better deadlifters than stockier folk. But anyhow, it would be good for you to learn proper form on the deadlift and it's overall growth producing potential is greater than the SLDL. But, the recovery ability needed to recover from a few sets of hard DLs vs. SLDLs is a lot greater.
Reason being is that the muscles of the mid and low back tend to fatigue first in the DL, putting people at a risk of injury if they are pulling in a state of fatigue.
This is typically a major issue when people are getting to pull some serious weights. But by all means, give it a try and see what works for you. If I were you though, I'd keep my reps lower on DLs. Even if you want to do a set of 6-8, I'd say stick with doing sets of 3-5 with your 6-8RM and just do more sets for increased volume.