At one point the 100x was my main racket and i completely loved the ease of use. slightly larger sweet spot and speed of the racket. Ive never used any Lining rackets till now so i cant compare. But ill definetly recommend you to give the 100x a try!
I got both in 4u. Overall 100x wins in almost everything (clear, control, defense). 900 sun is just a tiny bit more powerful in smash.