Using RS2 and RS+

We have local NTRIP data stream.
We are using one RS+ and one RS2.
Should we use the RS2 as Base and the RS+ as Rover?
OR
Should we do the opposite and use the RS+ as the base and the RS2 as the rover?
Advanatges/ Disadvantages?
Thanks.

The RS2 needs a multifrequency correction stream to do RTK, so RS2 as base, RS+ as rover.

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