Our SOP recommends (but of course you can deviate) that both use MAP if you have two FMC and two GPS receivers. That still leaves you with the raw data ILS indication on the PFD which is an approved crosscheck.
If you have only one FMC and/or only one GPS it is recommended that one pilot, preferrably the PF, use expanded ILS mode.
All that for the 737, but our classics have been phased out by now.