I mainly practice 3x3, and have cubed since 12, but have been horribly inconsistent and sometimes wonder where I'd be if I practiced fully since then. I average 14 and aim to be sub-10 by the end of 2021.
I do 2x2 and 4x4, but much much less; I also have a 7x7 which I solve for fun. I have a cube for every WCA event except 5x5 and 6x6 but I barely do them
I don’t have a favorite per se, but I love all of the WeiLong releases, from the original, to the GTS2, GTS3, WRMs, etc. because they’re all legendary and timeless