High end, low end, middle of the road? I think this could be less important than making sure you get rotary tables that are compatible with the application they are for, and the machines they will be used on.
Are these tables going to be used in full fourth axis mode or are they just going to be positioning, like an indexer?
If they are going to be used in full axis mode what kind of cutting load are they likely to encounter and what type of feedrate is wanted.
If they are going to be used just for indexing the position of something is it necessary to have a very fast index time?
What is the weight of the parts to be machined; the table has to carry any cantilevered load.
How will the parts be mounted, with a chuck, custom fixture, collets? Are these items included in the budget?
Or will it be long parts so a tail bearing will be needed.
I cannot come up with any other questions but I am sure someone will.
An open mind is a virtue...so long as all the common sense has not leaked out.