As an old-ass crusty spot mediocre skater, I feel like a kid in a candy store with all the new recent "semi-soft" wheels hitting the market. My $0.02 as a quick summary:
Dragons: Great for super-crusty spots and just cruising around streets. On smooth terrain, I don't really love these -- they're a tad too bouncy and sticky plus they're way too quiet. But as for cruising, I most probably won't go back to "real" soft wheels that don't slide -- prolly gonna set up my cruiser with big Dragons from now on.
X97: Handles crust really well, but lacks a bit of speed. Seem to wear down fast. These somehow fall in between the Dragons and the X99s in a way that I feel that I won't be skating them that much. Still a good wheel for crusty spots, though. Not a bad wheel, but seems like I won't have that much use for them with regards to having other options.
X99: My favorite wheel at the moment. Been absolutely loving them in my dusty local indoor for the winter, and had a good time on them on my first outdoor sessions of the spring. These just might be the best all-around wheel of all time, provided there can be such a thing. They're faster than the Dragons and the X97s, work pretty great on smooth ground, slide great, give out a decent bark. They feel like a real wheel. Still haven't properly tested them on super smooth outdoor concrete parks/plazas, looking forward to doing that soon. In a nutshell, if one feels too lazy to swap from one set of wheels to another all the time, these might be the ones that cover all bases decently enough. Plus they are easier on one's knees, joints and old man's pains. Mind you, I'm not saying they are better than F4 99/101 on perfect ground, but they are definitely skateable pretty much anywhere.
F4 93: Based on various reviews, really looking forward to these. I don't know if I actually need them, but will buy a set for sure as I love all sorts of middle age Kool-Aid.
God bless the gods of urethane and their apostles.