Which model you are using in OptionVue (Variable, New variable, EIEIO)? I also have OV and a long time user not sure I accept their greeks are better. Their Var, New Var models are very optimistic, In down move relying on their greeks is not a very good idea. EIEIO model is same as TOS and atleast have realistic greeks.
TOS also can combine positions and can give total position greeks. Where OV excels is overlaying two positions one above the other and backtesting. Overlaing of two positions cannot be done is TOS. Backtesting can be done in TOS, but not very easy.
Main problem with OV is it is just analyzing software. It is not connected to broker seamlessly. Mistakes bound to happen during transfer of positions. Also, If you have lot of trades, every-time you make a trade or adjust entering or transferring can be a chore.