The LCFS911 I have built for my wife and son, so I cant really evaluate them since they are too small.
The LCFS947 is a great climber when its technical and speed is not important. I think its my first choice to really go technical places. It when its time to go down again its super stable , no drama at all.
The LCFS958 is the great all-rounder. If i think that I will need to try and keep up with biking friends on trail-riding I take the LCFS958. Its faster, it climbs well, its good on the descents but compared to the LCFS947 need a little more concentration to be safe. And when its flat it can cary good speed. If i had to choose one of the, that's really, really hard. but i think it would be the LCFS947.
The LCFS917 is far away from that and i really dont know what to do with it. But it so fun to build that I caould not stop myself when Light Carbon offered me the frame. I wantet to order a LCFS911 in my size but the delivery time was so long so they offered the 917 instead.