Hi, I've been cubing for 2 weeks now, my average time is around 2'30 (beginner's method), so cubes don't really make a big difference at this stage. However, I've got a Thunderclap, a Yulong and a Guanlong (best times are 1'56 with a Thunderclap, 1'58 with the Yulong), all stickerless.
On one hand the Thunderclap is slightly too loose for me, I'm not experienced enough to fully exploit its potential, and the Guanlong is too light, I just use it as a back up cube or for cubing while commuting, it's expendable. On the other hand I really enjoy the Yulong, the feeling, the noise and the weight (slightly heavier than the Thunderclap). Although it's probably a middle range cube, it's clearly my favorite.
So based from my observations, what would be the right cube to upgrade from the Yulong? (stickerless or white/primary/original colour)