Hmm. My Thunderclap and Yuexiao (both setup the same way) seems to be different. My Thunderclap is very stable and doesn't flex at all, and isn't as fast as my Yuexiao. On the other hand, the Yuexiao is quite flexy and unstable, and very fast. I tried putting some weight 5 which made my Thunderclap slow down to a very controllable speed for practicing lookahead but my Yuexiao is still decently fast.
My Tanglong is horribly slow even after lubing. Even after using some Weight 2 or 1, it feels gummy and 'sticky' and quite horrible to speedsolve with. I don't think my Tanglong likes lube very much. It became horribly slow. It might just be me, though. My tps is quite fast which is why I prefer faster cubes. And no, I didn't overlube any of the above cubes.
Don't get the zhanchi. I really like its smooth buttery feel but it's just too locky for me and it pops a ton. Really outdated too compared to newer cubes.
To summarise, I think Thunderclap is a great cube to have whether you're a beginner, or a pro. Apparently you might need some setting up to prevent some flexing(?) and maybe slow it down if you like. If you like a slower cube which doesn't need much setup, then get the Tanglong, but it's a bit blockier than the Aolong. If you're looking for a fast cube to spam tps on, then get the Yuexiao or maybe Hualong.