Yes, it's the front lever... the back lever is mostly a shoulder mobility + posterior chain isometric exercise.
Furthermore, if someone has very tight shoulders, it can actually make holding a back lever fairly easy since the tightness basically locks the upper body in place, you only have to maintain the lower body hard and fixed.
I'm not an expert in lever work. But I feel that the main benefit of this exercise is through holds. I like submaximal holds (about 60-70%) so if your maximum hold in any given front lever variation (tucked with rounded lower back, tucked with flat lower back, semi-tucked, 1-leg extended, straddle, full lever) is let's say 10 seconds, then a 70-80% effort would be sets of 6 to 7 seconds. Doing 3-5 total sets.