Crashes are an important factor:
Don't buy things that are fragile and don't buy things that you can't afford to replace.
I guess that applies more to rims than it does to hubs.
Hence my earlier comment that 'cheap' is the most attractive attribute in a track rim, & my oft-repeated advice that anybody who needs posh wheels will no longer be paying for their own.
Crashes are an important factor:
Don't buy things that are fragile and don't buy things that you can't afford to replace.
I guess that applies more to rims than it does to hubs.