VT vs RVT capacitors : what do they mean?
Not much of an answer, but here we go:
As far as I know, VT is used as a series moniker for (Chinese) unbranded and also for branded (Multicomp Pro) capacitors.
RVT is a series of capacitors made by Elna, but it is also the marking of a series of wide-temperature capacitors by Xuanx, and probably others.
Both VT and RVT are names of series of capacitors (capacitors that share specs, made by one manufacturer), but the actual meaning of the names and markings (and the specs of the capacitors) will vary from manufacturer to manufacturer.
The markings only make sense when you know the manufacturer so you can look up the appropriate datasheets.