I would say get the YOKOMO BD. I been running thiscar on carpet for the last 5-6 months and I'm pretty competitive with this car till they close the track down
... But luckily they will open a new better carpet track here in my area.
I have the fastest lap time and my local track so far running against
X-ray,RDX and Tamiya on both expert stock and 19T class considering I'm the only guy running the YOKOMO BD.
This car tweaks easy so I suggest you use a cone washer on your top deck to solve this issue.